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0a6e6d705b
Actually mutually recursive CTE were not functional. Now the code for mutually recursive CTE looks like functional, but still needs re-writing. Added many new test cases for mutually recursive CTE.
1103 lines
30 KiB
Text
1103 lines
30 KiB
Text
create table t1 (a int, b varchar(32));
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insert into t1 values
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(4,'aaaa' ), (7,'bb'), (1,'ccc'), (4,'dd');
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insert into t1 values
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(3,'eee'), (7,'bb'), (1,'fff'), (4,'ggg');
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with recursive
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a1(a,b) as
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(select * from t1 where t1.a>3
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union
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select * from b1 where b1.a >3
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union
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select * from c1 where c1.a>3),
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b1(a,b) as
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(select * from a1 where a1.b > 'ccc'
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union
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select * from c1 where c1.b > 'ddd'),
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c1(a,b) as
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(select * from a1 where a1.a<6 and a1.b< 'zz'
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union
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select * from b1 where b1.b > 'auu')
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select * from c1;
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ERROR HY000: No anchors for recursive WITH element 'b1'
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drop table t1;
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# WITH RECURSIVE vs just WITH
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create table t1 (a int);
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insert into t1 values
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(0), (1), (2), (3), (4);
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create table t2 (a int);
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insert into t2 values
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(1), (2), (3), (4), (5);
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# just WITH : s refers to t defined after s
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with
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s(a) as (select t.a + 10 from t),
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t(a) as (select t1.a from t1)
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select * from s;
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ERROR 42S02: Table 'test.t' doesn't exist
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# WITH RECURSIVE: s refers to t defined after s
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with recursive
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s(a) as (select t.a + 10 from t),
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t(a) as (select t1.a from t1)
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select * from s;
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a
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10
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11
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12
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13
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14
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# just WITH : defined t1 is non-recursive and uses base tables t1,t2
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with
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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a
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3
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1
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2
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4
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5
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explain
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with
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 30
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 Using where
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3 UNION t1 ALL NULL NULL NULL NULL 5
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3 UNION t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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#WITH RECURSIVE : defined t1 is recursive and uses only base table t2
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with recursive
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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a
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3
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4
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5
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explain
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with recursive
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 30
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2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 Using where
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3 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 5
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3 UNCACHEABLE UNION t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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# just WITH : types of t1 columns are determined by all parts of union
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create view v1 as
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with
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a+1 from t1,t2 where t1.a=t2.a
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)
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select * from t1;
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show columns from v1;
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Field Type Null Key Default Extra
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a bigint(20) YES NULL
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# WITH RECURSIVE : types of t1 columns are determined by anchor parts
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create view v2 as
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with recursive
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a+1 from t1,t2 where t1.a=t2.a
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)
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select * from t1;
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show columns from v2;
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Field Type Null Key Default Extra
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a int(11) YES NULL
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drop view v1,v2;
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drop table t1,t2;
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create table folks(id int, name char(32), dob date, father int, mother int);
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insert into folks values
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(100, 'Me', '2000-01-01', 20, 30),
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(20, 'Dad', '1970-02-02', 10, 9),
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(30, 'Mom', '1975-03-03', 8, 7),
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(10, 'Grandpa Bill', '1940-04-05', null, null),
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(9, 'Grandma Ann', '1941-10-15', null, null),
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(25, 'Uncle Jim', '1968-11-18', 8, 7),
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(98, 'Sister Amy', '2001-06-20', 20, 30),
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(7, 'Grandma Sally', '1943-08-23', null, 6),
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(8, 'Grandpa Ben', '1940-10-21', null, null),
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(6, 'Grandgrandma Martha', '1923-05-17', null, null),
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(67, 'Cousin Eddie', '1992-02-28', 25, 27),
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(27, 'Auntie Melinda', '1971-03-29', null, null);
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me' and dob = '2000-01-01'
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union
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select p.id, p.name, p.dob, p.father, p.mother
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from folks as p, ancestors AS a
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where p.id = a.father or p.id = a.mother
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)
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select * from ancestors;
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id name dob father mother
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100 Me 2000-01-01 20 30
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20 Dad 1970-02-02 10 9
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30 Mom 1975-03-03 8 7
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10 Grandpa Bill 1940-04-05 NULL NULL
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9 Grandma Ann 1941-10-15 NULL NULL
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7 Grandma Sally 1943-08-23 NULL 6
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8 Grandpa Ben 1940-10-21 NULL NULL
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6 Grandgrandma Martha 1923-05-17 NULL NULL
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with recursive
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ancestors
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as
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(
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select p.*
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from folks as p, ancestors AS a
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where p.id = a.father or p.id = a.mother
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union
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select *
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from folks
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where name = 'Me' and dob = '2000-01-01'
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)
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select * from ancestors;
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id name dob father mother
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100 Me 2000-01-01 20 30
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20 Dad 1970-02-02 10 9
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30 Mom 1975-03-03 8 7
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10 Grandpa Bill 1940-04-05 NULL NULL
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9 Grandma Ann 1941-10-15 NULL NULL
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7 Grandma Sally 1943-08-23 NULL 6
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8 Grandpa Ben 1940-10-21 NULL NULL
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6 Grandgrandma Martha 1923-05-17 NULL NULL
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Cousin Eddie'
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union
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select p.*
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from folks as p, ancestors as a
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where p.id = a.father or p.id = a.mother
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)
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select * from ancestors;
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id name dob father mother
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67 Cousin Eddie 1992-02-28 25 27
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25 Uncle Jim 1968-11-18 8 7
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27 Auntie Melinda 1971-03-29 NULL NULL
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7 Grandma Sally 1943-08-23 NULL 6
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8 Grandpa Ben 1940-10-21 NULL NULL
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6 Grandgrandma Martha 1923-05-17 NULL NULL
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me' or name='Sister Amy'
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union
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select p.*
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from folks as p, ancestors as a
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where p.id = a.father or p.id = a.mother
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)
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select * from ancestors;
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id name dob father mother
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100 Me 2000-01-01 20 30
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98 Sister Amy 2001-06-20 20 30
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20 Dad 1970-02-02 10 9
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30 Mom 1975-03-03 8 7
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10 Grandpa Bill 1940-04-05 NULL NULL
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9 Grandma Ann 1941-10-15 NULL NULL
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7 Grandma Sally 1943-08-23 NULL 6
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8 Grandpa Ben 1940-10-21 NULL NULL
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6 Grandgrandma Martha 1923-05-17 NULL NULL
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with recursive
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prev_gen
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as
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(
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select folks.*
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from folks, prev_gen
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where folks.id=prev_gen.father or folks.id=prev_gen.mother
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union
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select *
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from folks
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where name='Me'
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),
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ancestors
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as
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(
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select *
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from folks
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where name='Me'
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union
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select *
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from ancestors
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union
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select *
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from prev_gen
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)
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select ancestors.name, ancestors.dob from ancestors;
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name dob
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Me 2000-01-01
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Dad 1970-02-02
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Mom 1975-03-03
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Grandpa Bill 1940-04-05
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Grandma Ann 1941-10-15
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Grandma Sally 1943-08-23
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Grandpa Ben 1940-10-21
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Grandgrandma Martha 1923-05-17
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with recursive
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descendants
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as
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(
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select *
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from folks
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where name = 'Grandpa Bill'
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union
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select folks.*
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from folks, descendants as d
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where d.id=folks.father or d.id=folks.mother
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)
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select * from descendants;
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id name dob father mother
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10 Grandpa Bill 1940-04-05 NULL NULL
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20 Dad 1970-02-02 10 9
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100 Me 2000-01-01 20 30
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98 Sister Amy 2001-06-20 20 30
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with recursive
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descendants
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as
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(
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select *
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from folks
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where name = 'Grandma Sally'
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union
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select folks.*
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from folks, descendants as d
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where d.id=folks.father or d.id=folks.mother
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)
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select * from descendants;
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id name dob father mother
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7 Grandma Sally 1943-08-23 NULL 6
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30 Mom 1975-03-03 8 7
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25 Uncle Jim 1968-11-18 8 7
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100 Me 2000-01-01 20 30
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98 Sister Amy 2001-06-20 20 30
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67 Cousin Eddie 1992-02-28 25 27
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me' and dob = '2000-01-01'
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union
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select p.*
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from folks as p, ancestors AS a
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where p.id = a.father OR p.id = a.mother
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)
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select *
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from ancestors t1, ancestors t2
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where exists (select * from ancestors a
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where a.father=t1.id AND a.mother=t2.id);
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id name dob father mother id name dob father mother
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20 Dad 1970-02-02 10 9 30 Mom 1975-03-03 8 7
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10 Grandpa Bill 1940-04-05 NULL NULL 9 Grandma Ann 1941-10-15 NULL NULL
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8 Grandpa Ben 1940-10-21 NULL NULL 7 Grandma Sally 1943-08-23 NULL 6
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with
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ancestor_couples(husband, h_dob, wife, w_dob)
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as
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(
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me'
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union
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select p.*
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from folks as p, ancestors AS a
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where p.id = a.father OR p.id = a.mother
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)
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select t1.name, t1.dob, t2.name, t2.dob
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from ancestors t1, ancestors t2
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where exists (select * from ancestors a
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where a.father=t1.id AND a.mother=t2.id)
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)
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select * from ancestor_couples;
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husband h_dob wife w_dob
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Dad 1970-02-02 Mom 1975-03-03
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Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
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Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me'
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union
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select p.*
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from folks as p, ancestors as fa
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where p.id = fa.father
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union
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select p.*
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from folks as p, ancestors as ma
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where p.id = ma.mother
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)
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select * from ancestors;
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id name dob father mother
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100 Me 2000-01-01 20 30
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20 Dad 1970-02-02 10 9
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30 Mom 1975-03-03 8 7
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10 Grandpa Bill 1940-04-05 NULL NULL
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8 Grandpa Ben 1940-10-21 NULL NULL
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9 Grandma Ann 1941-10-15 NULL NULL
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7 Grandma Sally 1943-08-23 NULL 6
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6 Grandgrandma Martha 1923-05-17 NULL NULL
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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(
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select h.*, w.*
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from folks h, folks w, coupled_ancestors a
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where a.father = h.id AND a.mother = w.id
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union
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select h.*, w.*
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from folks v, folks h, folks w
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where v.name = 'Me' and
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(v.father = h.id AND v.mother= w.id)
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select h_id, h_name, h_dob, h_father, h_mother
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from ancestor_couples
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union
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select w_id, w_name, w_dob, w_father, w_mother
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from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
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h_name h_dob w_name w_dob
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Dad 1970-02-02 Mom 1975-03-03
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Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
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Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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(
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select h.*, w.*
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from folks h, folks w, coupled_ancestors a
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where a.father = h.id AND a.mother = w.id
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union
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select h.*, w.*
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from folks v, folks h, folks w
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where v.name = 'Me' and
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(v.father = h.id AND v.mother= w.id)
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select h_id, h_name, h_dob, h_father, h_mother
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from ancestor_couples
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union all
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select w_id, w_name, w_dob, w_father, w_mother
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from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
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h_name h_dob w_name w_dob
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Dad 1970-02-02 Mom 1975-03-03
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Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
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Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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(
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select h.*, w.*
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from folks h, folks w, coupled_ancestors a
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where a.father = h.id AND a.mother = w.id
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select *
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from folks
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where name = 'Me'
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union all
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select h_id, h_name, h_dob, h_father, h_mother
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from ancestor_couples
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union all
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select w_id, w_name, w_dob, w_father, w_mother
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from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
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h_name h_dob w_name w_dob
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Dad 1970-02-02 Mom 1975-03-03
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Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
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Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
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with recursive
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ancestor_couple_ids(h_id, w_id)
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as
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(
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select a.father, a.mother
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from coupled_ancestors a
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where a.father is not null and a.mother is not null
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select *
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from folks
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where name = 'Me'
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union all
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select p.*
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from folks p, ancestor_couple_ids fa
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where p.id = fa.h_id
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union all
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select p.*
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from folks p, ancestor_couple_ids ma
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where p.id = ma.w_id
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)
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select *
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from ancestor_couple_ids;
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h_id w_id
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20 30
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10 9
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8 7
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with recursive
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ancestor_couple_ids(h_id, w_id)
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as
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(
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select a.father, a.mother
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from coupled_ancestors a
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where a.father is not null and a.mother is not null
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select *
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from folks
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where name = 'Me'
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union all
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select p.*
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from folks p, ancestor_couple_ids fa
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where p.id = fa.h_id
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union all
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select p.*
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from folks p, ancestor_couple_ids ma
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where p.id = ma.w_id
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)
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select h.name, h.dob, w.name, w.dob
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from ancestor_couple_ids c, folks h, folks w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
name dob name dob
|
|
Dad 1970-02-02 Mom 1975-03-03
|
|
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
|
|
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
where a.father is not null and a.mother is not null
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
name dob name dob
|
|
Dad 1970-02-02 Mom 1975-03-03
|
|
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
|
|
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
|
|
explain extended
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
where a.father is not null and a.mother is not null
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 36 100.00
|
|
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 468 100.00 Using where; Using join buffer (flat, BNL join)
|
|
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 468 100.00 Using where; Using join buffer (incremental, BNL join)
|
|
3 SUBQUERY folks ALL NULL NULL NULL NULL 12 100.00 Using where
|
|
4 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 12 100.00
|
|
4 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 36 100.00 Using where; Using join buffer (flat, BNL join)
|
|
5 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
|
|
5 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 12 100.00 Using where; Using join buffer (flat, BNL join)
|
|
NULL UNION RESULT <union3,4,5> ALL NULL NULL NULL NULL NULL NULL
|
|
2 UNCACHEABLE SUBQUERY <derived3> ALL NULL NULL NULL NULL 36 100.00 Using where
|
|
Warnings:
|
|
Note 1003 with recursive ancestor_couple_ids as (select `a`.`father` AS `h_id`,`a`.`mother` AS `w_id` from `coupled_ancestors` `a` where ((`a`.`father` is not null) and (`a`.`mother` is not null)))coupled_ancestors as (select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where (`test`.`folks`.`name` = 'Me') union all select `test`.`p`.`id` AS `id`,`test`.`p`.`name` AS `name`,`test`.`p`.`dob` AS `dob`,`test`.`p`.`father` AS `father`,`test`.`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestor_couple_ids` `fa` where (`fa`.`h_id` = `test`.`p`.`id`) union all select `test`.`p`.`id` AS `id`,`test`.`p`.`name` AS `name`,`test`.`p`.`dob` AS `dob`,`test`.`p`.`father` AS `father`,`test`.`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestor_couple_ids` `ma` where (`test`.`p`.`id` = `ma`.`w_id`)), select `h`.`name` AS `name`,`h`.`dob` AS `dob`,`w`.`name` AS `name`,`w`.`dob` AS `dob` from `ancestor_couple_ids` `c` join `coupled_ancestors` `h` join `coupled_ancestors` `w` where ((`h`.`id` = `c`.`h_id`) and (`w`.`id` = `c`.`w_id`))
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select *
|
|
from ancestor_couple_ids;
|
|
h_id w_id
|
|
20 30
|
|
10 9
|
|
8 7
|
|
NULL NULL
|
|
NULL NULL
|
|
NULL NULL
|
|
NULL 6
|
|
NULL NULL
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
name dob name dob
|
|
Dad 1970-02-02 Mom 1975-03-03
|
|
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
|
|
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
|
|
prepare stmt1 from "
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me' and dob = '2000-01-01'
|
|
union
|
|
select p.id, p.name, p.dob, p.father, p.mother
|
|
from folks as p, ancestors AS a
|
|
where p.id = a.father or p.id = a.mother
|
|
)
|
|
select * from ancestors;
|
|
";
|
|
execute stmt1;
|
|
id name dob father mother
|
|
100 Me 2000-01-01 20 30
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
execute stmt1;
|
|
id name dob father mother
|
|
100 Me 2000-01-01 20 30
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
deallocate prepare stmt1;
|
|
create view v1 as
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me' and dob = '2000-01-01'
|
|
union
|
|
select p.id, p.name, p.dob, p.father, p.mother
|
|
from folks as p, ancestors AS a
|
|
where p.id = a.father or p.id = a.mother
|
|
)
|
|
select * from ancestors;
|
|
show create view v1;
|
|
View Create View character_set_client collation_connection
|
|
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS with recursive ancestors as (select `folks`.`id` AS `id`,`folks`.`name` AS `name`,`folks`.`dob` AS `dob`,`folks`.`father` AS `father`,`folks`.`mother` AS `mother` from `folks` where ((`folks`.`name` = 'Me') and (`folks`.`dob` = '2000-01-01')) union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from (`folks` `p` join `ancestors` `a`) where ((`p`.`id` = `a`.`father`) or (`p`.`id` = `a`.`mother`)))select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors` latin1 latin1_swedish_ci
|
|
select * from v1;
|
|
id name dob father mother
|
|
100 Me 2000-01-01 20 30
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
create view v2 as
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as fa
|
|
where p.id = fa.father
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as ma
|
|
where p.id = ma.mother
|
|
)
|
|
select * from ancestors;
|
|
show create view v2;
|
|
View Create View character_set_client collation_connection
|
|
v2 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS with recursive ancestors as (select `folks`.`id` AS `id`,`folks`.`name` AS `name`,`folks`.`dob` AS `dob`,`folks`.`father` AS `father`,`folks`.`mother` AS `mother` from `folks` where (`folks`.`name` = 'Me') union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from (`folks` `p` join `ancestors` `fa`) where (`p`.`id` = `fa`.`father`) union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from (`folks` `p` join `ancestors` `ma`) where (`p`.`id` = `ma`.`mother`))select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors` latin1 latin1_swedish_ci
|
|
select * from v2;
|
|
id name dob father mother
|
|
100 Me 2000-01-01 20 30
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
drop view v1,v2;
|
|
explain extended
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me' and dob = '2000-01-01'
|
|
union
|
|
select p.id, p.name, p.dob, p.father, p.mother
|
|
from folks as p, ancestors AS a
|
|
where p.id = a.father or p.id = a.mother
|
|
)
|
|
select * from ancestors;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 156 100.00
|
|
2 SUBQUERY folks ALL NULL NULL NULL NULL 12 100.00 Using where
|
|
3 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 12 100.00
|
|
3 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 12 100.00 Using where; Using join buffer (flat, BNL join)
|
|
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
|
|
Warnings:
|
|
Note 1003 with recursive ancestors as (select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where ((`test`.`folks`.`name` = 'Me') and (`test`.`folks`.`dob` = DATE'2000-01-01')) union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestors` `a` where ((`a`.`father` = `p`.`id`) or (`a`.`mother` = `p`.`id`)))select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors`
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
union
|
|
select father from folks, ancestor_ids a where folks.id = a.id
|
|
union
|
|
select mother from folks, ancestor_ids a where folks.id = a.id
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select p.* from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
id name dob father mother
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks as p, ancestors as fa
|
|
where p.id = fa.father
|
|
union all
|
|
select p.*
|
|
from folks as p, ancestors as ma
|
|
where p.id = ma.mother
|
|
)
|
|
select * from ancestors;
|
|
id name dob father mother
|
|
100 Me 2000-01-01 20 30
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me' and father is not null
|
|
union all
|
|
select mother, 1 from folks where name = 'Me' and mother is not null
|
|
union all
|
|
select father, fa.generation+1 from folks, ancestor_ids fa
|
|
where folks.id = fa.id and (father not in (select id from ancestor_ids))
|
|
union all
|
|
select mother, ma.generation+1 from folks, ancestor_ids ma
|
|
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
|
|
)
|
|
select generation, name from ancestor_ids a, folks
|
|
where a.id = folks.id;
|
|
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
|
|
set standards_compliant_cte=0;
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me' and father is not null
|
|
union all
|
|
select mother from folks where name = 'Me' and mother is not null
|
|
union all
|
|
select father, fa.generation+1 from folks, ancestor_ids fa
|
|
where folks.id = fa.id and (father not in (select id from ancestor_ids))
|
|
union all
|
|
select mother, ma.generation+1 from folks, ancestor_ids ma
|
|
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
|
|
)
|
|
select generation, name from ancestor_ids a, folks
|
|
where a.id = folks.id;
|
|
ERROR HY000: WITH column list and SELECT field list have different column counts
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me' and father is not null
|
|
union all
|
|
select mother, 1 from folks where name = 'Me' and mother is not null
|
|
union all
|
|
select father, fa.generation+1 from folks, ancestor_ids fa
|
|
where folks.id = fa.id and father is not null and
|
|
(father not in (select id from ancestor_ids))
|
|
union all
|
|
select mother, ma.generation+1 from folks, ancestor_ids ma
|
|
where folks.id = ma.id and mother is not null and
|
|
(mother not in (select id from ancestor_ids))
|
|
)
|
|
select generation, name from ancestor_ids a, folks
|
|
where a.id = folks.id;
|
|
generation name
|
|
1 Dad
|
|
1 Mom
|
|
2 Grandpa Bill
|
|
2 Grandpa Ben
|
|
2 Grandma Ann
|
|
2 Grandma Sally
|
|
3 Grandgrandma Martha
|
|
set standards_compliant_cte=1;
|
|
with recursive
|
|
coupled_ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me' and father is not null
|
|
union
|
|
select mother from folks where name = 'Me' and mother is not null
|
|
union
|
|
select n.father
|
|
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
|
|
where folks.father = fa.id and folks.mother = ma.id and
|
|
(fa.id = n.id or ma.id = n.id) and
|
|
n.father is not null and n.mother is not null
|
|
union
|
|
select n.mother
|
|
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
|
|
where folks.father = fa.id and folks.mother = ma.id and
|
|
(fa.id = n.id or ma.id = n.id) and
|
|
n.father is not null and n.mother is not null
|
|
)
|
|
select p.* from coupled_ancestor_ids a, folks p
|
|
where a.id = p.id;
|
|
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'coupled_ancestor_ids'
|
|
set statement standards_compliant_cte=0 for
|
|
with recursive
|
|
coupled_ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me' and father is not null
|
|
union
|
|
select mother from folks where name = 'Me' and mother is not null
|
|
union
|
|
select n.father
|
|
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
|
|
where folks.father = fa.id and folks.mother = ma.id and
|
|
(fa.id = n.id or ma.id = n.id) and
|
|
n.father is not null and n.mother is not null
|
|
union
|
|
select n.mother
|
|
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
|
|
where folks.father = fa.id and folks.mother = ma.id and
|
|
(fa.id = n.id or ma.id = n.id) and
|
|
n.father is not null and n.mother is not null
|
|
)
|
|
select p.* from coupled_ancestor_ids a, folks p
|
|
where a.id = p.id;
|
|
id name dob father mother
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
union
|
|
select father from folks left join ancestor_ids a on folks.id = a.id
|
|
union
|
|
select mother from folks left join ancestor_ids a on folks.id = a.id
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select p.* from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
|
|
set statement standards_compliant_cte=0 for
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
union
|
|
select father from folks left join ancestor_ids a on folks.id = a.id
|
|
union
|
|
select mother from folks left join ancestor_ids a on folks.id = a.id
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select p.* from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
id name dob father mother
|
|
20 Dad 1970-02-02 10 9
|
|
30 Mom 1975-03-03 8 7
|
|
10 Grandpa Bill 1940-04-05 NULL NULL
|
|
8 Grandpa Ben 1940-10-21 NULL NULL
|
|
25 Uncle Jim 1968-11-18 8 7
|
|
9 Grandma Ann 1941-10-15 NULL NULL
|
|
7 Grandma Sally 1943-08-23 NULL 6
|
|
6 Grandgrandma Martha 1923-05-17 NULL NULL
|
|
27 Auntie Melinda 1971-03-29 NULL NULL
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
union
|
|
select father, a.generation+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
union
|
|
select mother, a.generation+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select generation, name from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
generation name
|
|
1 Dad
|
|
1 Mom
|
|
2 Grandpa Bill
|
|
2 Grandpa Ben
|
|
2 Grandma Ann
|
|
2 Grandma Sally
|
|
3 Grandgrandma Martha
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
union
|
|
select max(father), max(a.generation)+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
group by a.generation
|
|
union
|
|
select max(mother), max(a.generation)+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
group by a.generation
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select generation, name from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
|
|
set statement standards_compliant_cte=0 for
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
union
|
|
select max(father), a.generation+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
group by a.generation
|
|
union
|
|
select max(mother), a.generation+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
group by a.generation
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select generation, name from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
generation name
|
|
1 Dad
|
|
1 Mom
|
|
2 Grandpa Bill
|
|
2 Grandma Ann
|
|
set statement max_recursion_level=2 for
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
union
|
|
select father, a.generation+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
union
|
|
select mother, a.generation+1 from folks, ancestor_ids a
|
|
where folks.id = a.id
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select generation, name from folks as p, ancestor_ids as a
|
|
where p.id = a.id
|
|
)
|
|
select * from ancestors;
|
|
generation name
|
|
1 Dad
|
|
1 Mom
|
|
2 Grandpa Bill
|
|
2 Grandpa Ben
|
|
2 Grandma Ann
|
|
2 Grandma Sally
|
|
drop table folks;
|