mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 20:12:31 +01:00
1206 lines
28 KiB
Text
1206 lines
28 KiB
Text
create table t1 (old_c1 integer, old_c2 integer,c1 integer, c2 integer, c3 integer) engine=InnoDB STATS_PERSISTENT=0;
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create view v1 as select * from t1 where c2=2;
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create trigger trg_t1 before update on t1 for each row
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begin
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set new.old_c1=old.c1;
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set new.old_c2=old.c2;
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end;
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/
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insert into t1(c1,c2,c3) values (1,1,1);
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insert into t1(c1,c2,c3) values (1,2,2);
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insert into t1(c1,c2,c3) values (1,3,3);
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insert into t1(c1,c2,c3) values (2,1,4);
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insert into t1(c1,c2,c3) values (2,2,5);
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insert into t1(c1,c2,c3) values (2,3,6);
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insert into t1(c1,c2,c3) values (2,4,7);
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insert into t1(c1,c2,c3) values (2,5,8);
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commit;
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select * from t1;
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old_c1 old_c2 c1 c2 c3
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NULL NULL 1 1 1
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NULL NULL 1 2 2
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NULL NULL 1 3 3
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NULL NULL 2 1 4
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NULL NULL 2 2 5
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NULL NULL 2 3 6
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NULL NULL 2 4 7
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NULL NULL 2 5 8
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Test without any index
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#
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# Update a with value from subquery on the same table, no search clause. ALL access
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#
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start transaction;
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update t1
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set c1=(select a.c3
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from t1 a
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where a.c3 = t1.c3);
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affected rows: 8
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info: Rows matched: 8 Changed: 8 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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concat(old_c1,'->',c1) c3 Changed
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1->1 1
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1->2 2 *
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1->3 3 *
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2->4 4 *
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2->5 5 *
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2->6 6 *
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2->7 7 *
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2->8 8 *
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rollback;
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#
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# Update with search clause on the same table
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#
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start transaction;
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update t1
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set c1=10
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where c1 <2
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and exists (select 'X'
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from t1 a
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where a.c1 = t1.c1);
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affected rows: 3
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info: Rows matched: 3 Changed: 3 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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concat(old_c1,'->',c1) c3 Changed
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1->10 1 *
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1->10 2 *
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1->10 3 *
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NULL 4
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NULL 5
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# Update via RANGE or INDEX access if an index or a primary key exists
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#
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explain update t1 set c1=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 > 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where
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1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
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2 MATERIALIZED a ALL NULL NULL NULL NULL 8
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start transaction;
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update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3;
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affected rows: 4
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info: Rows matched: 4 Changed: 4 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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1->11 3 *
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NULL 4
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NULL 5
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2->12 6 *
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2->12 7 *
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2->12 8 *
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rollback;
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#
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# Update with order by
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#
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start transaction;
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update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 order by c2;
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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1->11 3 *
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NULL 4
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NULL 5
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2->12 6 *
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2->12 7 *
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2->12 8 *
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rollback;
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#
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Update using a view in subquery
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#
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start transaction;
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update t1
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set c1=c1 +(select max(a.c2)
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from v1 a
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where a.c1 = t1.c1) ;
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affected rows: 8
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info: Rows matched: 8 Changed: 8 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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1->3 1 *
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1->3 2 *
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1->3 3 *
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2->4 4 *
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2->4 5 *
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2->4 6 *
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2->4 7 *
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2->4 8 *
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rollback;
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#
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# Update throw a view
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#
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start transaction;
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update v1
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set c1=c1 + (select max(a.c2)
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from t1 a
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where a.c1 = v1.c1) +10
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where c3 > 3;
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affected rows: 1
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info: Rows matched: 1 Changed: 1 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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NULL 3
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NULL 4
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2->17 5 *
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# Update through a view and using the view in subquery
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#
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start transaction;
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update v1
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set c1=c1 + 1
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where c1 <2
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and exists (select 'X'
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from v1 a
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where a.c1 = v1.c1);
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affected rows: 1
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info: Rows matched: 1 Changed: 1 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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1->2 2 *
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NULL 3
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NULL 4
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NULL 5
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# Update through a view and using the view in subquery
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#
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start transaction;
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update v1
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set c1=(select max(a.c1)+10
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from v1 a
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where a.c1 = v1.c1)
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where c1 <10
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and exists (select 'X'
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from v1 a
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where a.c2 = v1.c2);
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affected rows: 2
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info: Rows matched: 2 Changed: 2 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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1->11 2 *
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NULL 3
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NULL 4
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2->12 5 *
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# Update of the index or primary key (c3)
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#
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start transaction;
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explain update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8
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1 PRIMARY a ALL NULL NULL NULL NULL 8 Using where; FirstMatch(t1)
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update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
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affected rows: 8
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info: Rows matched: 8 Changed: 8 Warnings: 0
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select c3 from t1;
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c3
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11
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12
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13
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14
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15
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16
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17
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18
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rollback;
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#
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# update with a limit
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#
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start transaction;
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update t1
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set c1=(select a.c3
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from t1 a
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where a.c3 = t1.c3)
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limit 2;
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affected rows: 2
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info: Rows matched: 2 Changed: 2 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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concat(old_c1,'->',c1) c3 Changed
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1->1 1
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1->2 2 *
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NULL 3
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NULL 4
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NULL 5
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# update with a limit and an order by
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#
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start transaction;
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update t1
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set c1=(select a.c3
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from t1 a
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where a.c3 = t1.c3)
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order by c3 desc limit 2;
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affected rows: 2
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info: Rows matched: 2 Changed: 2 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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NULL 3
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NULL 4
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NULL 5
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NULL 6
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2->7 7 *
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2->8 8 *
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rollback;
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Test with an index on updated columns
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create index t1_c2 on t1 (c2,c1);
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#
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# Update a with value from subquery on the same table, no search clause. ALL access
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#
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start transaction;
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update t1
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set c1=(select a.c3
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from t1 a
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where a.c3 = t1.c3);
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affected rows: 8
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info: Rows matched: 8 Changed: 8 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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concat(old_c1,'->',c1) c3 Changed
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1->1 1
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1->2 2 *
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1->3 3 *
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2->4 4 *
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2->5 5 *
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2->6 6 *
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2->7 7 *
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2->8 8 *
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rollback;
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#
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# Update with search clause on the same table
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#
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start transaction;
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update t1
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set c1=10
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where c1 <2
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and exists (select 'X'
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from t1 a
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where a.c1 = t1.c1);
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affected rows: 3
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info: Rows matched: 3 Changed: 3 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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concat(old_c1,'->',c1) c3 Changed
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1->10 1 *
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1->10 2 *
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1->10 3 *
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NULL 4
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NULL 5
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# Update via RANGE or INDEX access if an index or a primary key exists
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#
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explain update t1 set c1=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 > 3;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 range t1_c2 t1_c2 5 NULL 2 Using where
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1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
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2 MATERIALIZED a range t1_c2 t1_c2 5 NULL 2 Using where; Using index
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start transaction;
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update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3;
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affected rows: 4
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info: Rows matched: 4 Changed: 4 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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1->11 3 *
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NULL 4
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NULL 5
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2->12 6 *
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2->12 7 *
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2->12 8 *
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rollback;
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#
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# Update with order by
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#
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start transaction;
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update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 order by c2;
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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1->11 3 *
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NULL 4
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NULL 5
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2->12 6 *
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2->12 7 *
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2->12 8 *
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rollback;
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#
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Update using a view in subquery
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#
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start transaction;
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update t1
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set c1=c1 +(select max(a.c2)
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from v1 a
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where a.c1 = t1.c1) ;
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affected rows: 8
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info: Rows matched: 8 Changed: 8 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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1->3 1 *
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1->3 2 *
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1->3 3 *
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2->4 4 *
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2->4 5 *
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2->4 6 *
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2->4 7 *
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2->4 8 *
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rollback;
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#
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# Update throw a view
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#
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start transaction;
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update v1
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set c1=c1 + (select max(a.c2)
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from t1 a
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where a.c1 = v1.c1) +10
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where c3 > 3;
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affected rows: 1
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info: Rows matched: 1 Changed: 1 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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NULL 2
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NULL 3
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NULL 4
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2->17 5 *
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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# Update through a view and using the view in subquery
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#
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start transaction;
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update v1
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set c1=c1 + 1
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where c1 <2
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and exists (select 'X'
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from v1 a
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where a.c1 = v1.c1);
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affected rows: 1
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info: Rows matched: 1 Changed: 1 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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concat(old_c1,'->',c1) c3 Changed
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NULL 1
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1->2 2 *
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NULL 3
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NULL 4
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NULL 5
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NULL 6
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NULL 7
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NULL 8
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rollback;
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#
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|
# Update through a view and using the view in subquery
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|
#
|
|
start transaction;
|
|
update v1
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set c1=(select max(a.c1)+10
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|
from v1 a
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where a.c1 = v1.c1)
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where c1 <10
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|
and exists (select 'X'
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|
from v1 a
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where a.c2 = v1.c2);
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affected rows: 2
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info: Rows matched: 2 Changed: 2 Warnings: 0
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select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
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|
concat(old_c1,'->',c1) c3 Changed
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NULL 1
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|
1->11 2 *
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|
NULL 3
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|
NULL 4
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|
2->12 5 *
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NULL 6
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NULL 7
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NULL 8
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rollback;
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|
#
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|
# Update of the index or primary key (c3)
|
|
#
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|
start transaction;
|
|
explain update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
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|
1 PRIMARY t1 ALL t1_c2 NULL NULL NULL 8 Using where
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1 PRIMARY a ref t1_c2 t1_c2 10 test.t1.c2,test.t1.c1 1 Using index; FirstMatch(t1)
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update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
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affected rows: 8
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|
info: Rows matched: 8 Changed: 8 Warnings: 0
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select c3 from t1;
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c3
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11
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12
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13
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14
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|
15
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|
16
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|
17
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|
18
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rollback;
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|
#
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|
# update with a limit
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|
#
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|
start transaction;
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|
update t1
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set c1=(select a.c3
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from t1 a
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where a.c3 = t1.c3)
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limit 2;
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affected rows: 2
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|
info: Rows matched: 2 Changed: 2 Warnings: 0
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|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
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|
concat(old_c1,'->',c1) c3 Changed
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1->1 1
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|
1->2 2 *
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|
NULL 3
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|
NULL 4
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|
NULL 5
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|
NULL 6
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|
NULL 7
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NULL 8
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rollback;
|
|
#
|
|
# update with a limit and an order by
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3)
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order by c3 desc limit 2;
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
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|
NULL 1
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|
NULL 2
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
2->7 7 *
|
|
2->8 8 *
|
|
rollback;
|
|
Test with an index on updated columns
|
|
create index t1_c3 on t1 (c3);
|
|
#
|
|
# Update a with value from subquery on the same table, no search clause. ALL access
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3);
|
|
affected rows: 8
|
|
info: Rows matched: 8 Changed: 8 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->1 1
|
|
1->2 2 *
|
|
1->3 3 *
|
|
2->4 4 *
|
|
2->5 5 *
|
|
2->6 6 *
|
|
2->7 7 *
|
|
2->8 8 *
|
|
rollback;
|
|
#
|
|
# Update with search clause on the same table
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=10
|
|
where c1 <2
|
|
and exists (select 'X'
|
|
from t1 a
|
|
where a.c1 = t1.c1);
|
|
affected rows: 3
|
|
info: Rows matched: 3 Changed: 3 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->10 1 *
|
|
1->10 2 *
|
|
1->10 3 *
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update via RANGE or INDEX access if an index or a primary key exists
|
|
#
|
|
explain update t1 set c1=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 > 3;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 range t1_c2 t1_c2 5 NULL 2 Using where
|
|
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
|
|
2 MATERIALIZED a range t1_c2 t1_c2 5 NULL 2 Using where; Using index
|
|
start transaction;
|
|
update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3;
|
|
affected rows: 4
|
|
info: Rows matched: 4 Changed: 4 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
1->11 3 *
|
|
NULL 4
|
|
NULL 5
|
|
2->12 6 *
|
|
2->12 7 *
|
|
2->12 8 *
|
|
rollback;
|
|
#
|
|
# Update with order by
|
|
#
|
|
start transaction;
|
|
update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 order by c2;
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
1->11 3 *
|
|
NULL 4
|
|
NULL 5
|
|
2->12 6 *
|
|
2->12 7 *
|
|
2->12 8 *
|
|
rollback;
|
|
#
|
|
Update using a view in subquery
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=c1 +(select max(a.c2)
|
|
from v1 a
|
|
where a.c1 = t1.c1) ;
|
|
affected rows: 8
|
|
info: Rows matched: 8 Changed: 8 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->3 1 *
|
|
1->3 2 *
|
|
1->3 3 *
|
|
2->4 4 *
|
|
2->4 5 *
|
|
2->4 6 *
|
|
2->4 7 *
|
|
2->4 8 *
|
|
rollback;
|
|
#
|
|
# Update throw a view
|
|
#
|
|
start transaction;
|
|
update v1
|
|
set c1=c1 + (select max(a.c2)
|
|
from t1 a
|
|
where a.c1 = v1.c1) +10
|
|
where c3 > 3;
|
|
affected rows: 1
|
|
info: Rows matched: 1 Changed: 1 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
NULL 3
|
|
NULL 4
|
|
2->17 5 *
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update through a view and using the view in subquery
|
|
#
|
|
start transaction;
|
|
update v1
|
|
set c1=c1 + 1
|
|
where c1 <2
|
|
and exists (select 'X'
|
|
from v1 a
|
|
where a.c1 = v1.c1);
|
|
affected rows: 1
|
|
info: Rows matched: 1 Changed: 1 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
1->2 2 *
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update through a view and using the view in subquery
|
|
#
|
|
start transaction;
|
|
update v1
|
|
set c1=(select max(a.c1)+10
|
|
from v1 a
|
|
where a.c1 = v1.c1)
|
|
where c1 <10
|
|
and exists (select 'X'
|
|
from v1 a
|
|
where a.c2 = v1.c2);
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
1->11 2 *
|
|
NULL 3
|
|
NULL 4
|
|
2->12 5 *
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update of the index or primary key (c3)
|
|
#
|
|
start transaction;
|
|
explain update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL t1_c2 NULL NULL NULL 8 Using where
|
|
1 PRIMARY a ref t1_c2 t1_c2 10 test.t1.c2,test.t1.c1 1 Using index; FirstMatch(t1)
|
|
update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
|
|
affected rows: 8
|
|
info: Rows matched: 8 Changed: 8 Warnings: 0
|
|
select c3 from t1;
|
|
c3
|
|
11
|
|
12
|
|
13
|
|
14
|
|
15
|
|
16
|
|
17
|
|
18
|
|
rollback;
|
|
#
|
|
# update with a limit
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3)
|
|
limit 2;
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->1 1
|
|
1->2 2 *
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# update with a limit and an order by
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3)
|
|
order by c3 desc limit 2;
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
2->7 7 *
|
|
2->8 8 *
|
|
rollback;
|
|
Test with a primary key on updated columns
|
|
drop index t1_c3 on t1;
|
|
alter table t1 add primary key (c3);
|
|
#
|
|
# Update a with value from subquery on the same table, no search clause. ALL access
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3);
|
|
affected rows: 8
|
|
info: Rows matched: 8 Changed: 8 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->1 1
|
|
1->2 2 *
|
|
1->3 3 *
|
|
2->4 4 *
|
|
2->5 5 *
|
|
2->6 6 *
|
|
2->7 7 *
|
|
2->8 8 *
|
|
rollback;
|
|
#
|
|
# Update with search clause on the same table
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=10
|
|
where c1 <2
|
|
and exists (select 'X'
|
|
from t1 a
|
|
where a.c1 = t1.c1);
|
|
affected rows: 3
|
|
info: Rows matched: 3 Changed: 3 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->10 1 *
|
|
1->10 2 *
|
|
1->10 3 *
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update via RANGE or INDEX access if an index or a primary key exists
|
|
#
|
|
explain update t1 set c1=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 > 3;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 range t1_c2 t1_c2 5 NULL 2 Using where
|
|
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
|
|
2 MATERIALIZED a range t1_c2 t1_c2 5 NULL 2 Using where; Using index
|
|
start transaction;
|
|
update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3;
|
|
affected rows: 4
|
|
info: Rows matched: 4 Changed: 4 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
1->11 3 *
|
|
NULL 4
|
|
NULL 5
|
|
2->12 6 *
|
|
2->12 7 *
|
|
2->12 8 *
|
|
rollback;
|
|
#
|
|
# Update with order by
|
|
#
|
|
start transaction;
|
|
update t1 set c1=c1+10 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 order by c2;
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
1->11 3 *
|
|
NULL 4
|
|
NULL 5
|
|
2->12 6 *
|
|
2->12 7 *
|
|
2->12 8 *
|
|
rollback;
|
|
#
|
|
Update using a view in subquery
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=c1 +(select max(a.c2)
|
|
from v1 a
|
|
where a.c1 = t1.c1) ;
|
|
affected rows: 8
|
|
info: Rows matched: 8 Changed: 8 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->3 1 *
|
|
1->3 2 *
|
|
1->3 3 *
|
|
2->4 4 *
|
|
2->4 5 *
|
|
2->4 6 *
|
|
2->4 7 *
|
|
2->4 8 *
|
|
rollback;
|
|
#
|
|
# Update throw a view
|
|
#
|
|
start transaction;
|
|
update v1
|
|
set c1=c1 + (select max(a.c2)
|
|
from t1 a
|
|
where a.c1 = v1.c1) +10
|
|
where c3 > 3;
|
|
affected rows: 1
|
|
info: Rows matched: 1 Changed: 1 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
NULL 3
|
|
NULL 4
|
|
2->17 5 *
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update through a view and using the view in subquery
|
|
#
|
|
start transaction;
|
|
update v1
|
|
set c1=c1 + 1
|
|
where c1 <2
|
|
and exists (select 'X'
|
|
from v1 a
|
|
where a.c1 = v1.c1);
|
|
affected rows: 1
|
|
info: Rows matched: 1 Changed: 1 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
1->2 2 *
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update through a view and using the view in subquery
|
|
#
|
|
start transaction;
|
|
update v1
|
|
set c1=(select max(a.c1)+10
|
|
from v1 a
|
|
where a.c1 = v1.c1)
|
|
where c1 <10
|
|
and exists (select 'X'
|
|
from v1 a
|
|
where a.c2 = v1.c2);
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
1->11 2 *
|
|
NULL 3
|
|
NULL 4
|
|
2->12 5 *
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# Update of the index or primary key (c3)
|
|
#
|
|
start transaction;
|
|
explain update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL t1_c2 NULL NULL NULL 8 Using where
|
|
1 PRIMARY a ref t1_c2 t1_c2 10 test.t1.c2,test.t1.c1 1 Using index; FirstMatch(t1)
|
|
update t1 set c3=c3+10 where c2 in (select distinct a.c2 from t1 a where t1.c1=a.c1);
|
|
affected rows: 8
|
|
info: Rows matched: 8 Changed: 8 Warnings: 0
|
|
select c3 from t1;
|
|
c3
|
|
11
|
|
14
|
|
12
|
|
15
|
|
13
|
|
16
|
|
17
|
|
18
|
|
rollback;
|
|
#
|
|
# update with a limit
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3)
|
|
limit 2;
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
1->1 1
|
|
1->2 2 *
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
NULL 7
|
|
NULL 8
|
|
rollback;
|
|
#
|
|
# update with a limit and an order by
|
|
#
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c3
|
|
from t1 a
|
|
where a.c3 = t1.c3)
|
|
order by c3 desc limit 2;
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
select concat(old_c1,'->',c1),c3, case when c1 != old_c1 then '*' else ' ' end "Changed" from t1 ;
|
|
concat(old_c1,'->',c1) c3 Changed
|
|
NULL 1
|
|
NULL 2
|
|
NULL 3
|
|
NULL 4
|
|
NULL 5
|
|
NULL 6
|
|
2->7 7 *
|
|
2->8 8 *
|
|
rollback;
|
|
# Update with error "Subquery returns more than 1 row"
|
|
update t1 set c2=(select c2 from t1);
|
|
ERROR 21000: Subquery returns more than 1 row
|
|
# Update with error "Subquery returns more than 1 row" and order by
|
|
update t1 set c2=(select c2 from t1) order by c3;
|
|
ERROR 21000: Subquery returns more than 1 row
|
|
Duplicate value on update a primary key
|
|
start transaction;
|
|
update t1 set c3=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3;
|
|
ERROR 23000: Duplicate entry '0' for key 'PRIMARY'
|
|
rollback;
|
|
Duplicate value on update a primary key with ignore
|
|
start transaction;
|
|
update ignore t1 set c3=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3;
|
|
affected rows: 4
|
|
info: Rows matched: 4 Changed: 4 Warnings: 0
|
|
rollback;
|
|
Duplicate value on update a primary key and limit
|
|
start transaction;
|
|
update t1 set c3=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 limit 2;
|
|
ERROR 23000: Duplicate entry '0' for key 'PRIMARY'
|
|
rollback;
|
|
Duplicate value on update a primary key with ignore and limit
|
|
start transaction;
|
|
update ignore t1 set c3=0 where exists (select 'X' from t1 a where a.c2 = t1.c2) and c2 >= 3 limit 2;
|
|
affected rows: 2
|
|
info: Rows matched: 2 Changed: 2 Warnings: 0
|
|
rollback;
|
|
# Update no rows found
|
|
update t1
|
|
set c1=10
|
|
where c1 <2
|
|
and exists (select 'X'
|
|
from t1 a
|
|
where a.c1 = t1.c1 + 10);
|
|
affected rows: 0
|
|
info: Rows matched: 0 Changed: 0 Warnings: 0
|
|
# Update no rows changed
|
|
drop trigger trg_t1;
|
|
start transaction;
|
|
update t1
|
|
set c1=c1
|
|
where c1 <2
|
|
and exists (select 'X'
|
|
from t1 a
|
|
where a.c1 = t1.c1);
|
|
affected rows: 0
|
|
info: Rows matched: 3 Changed: 0 Warnings: 0
|
|
rollback;
|
|
#
|
|
# Check call of after trigger
|
|
#
|
|
create or replace trigger trg_t2 after update on t1 for each row
|
|
begin
|
|
declare msg varchar(100);
|
|
if (new.c3 = 5) then
|
|
set msg=concat('in after update trigger on ',new.c3);
|
|
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = msg;
|
|
end if;
|
|
end;
|
|
/
|
|
update t1 set c1=2 where c3 in (select distinct a.c3 from t1 a where a.c1=t1.c1);
|
|
ERROR 45000: in after update trigger on 5
|
|
#
|
|
# Check update with order by and after trigger
|
|
#
|
|
update t1 set c1=2 where c3 in (select distinct a.c3 from t1 a where a.c1=t1.c1) order by t1.c2;
|
|
ERROR 45000: in after update trigger on 5
|
|
drop view v1;
|
|
#
|
|
# Check update on view with check option
|
|
#
|
|
create view v1 as select * from t1 where c2=2 with check option;
|
|
start transaction;
|
|
update v1 set c2=3 where c1=1;
|
|
ERROR 44000: CHECK OPTION failed `test`.`v1`
|
|
rollback;
|
|
start transaction;
|
|
update v1 set c2=(select max(c3) from v1) where c1=1;
|
|
ERROR 44000: CHECK OPTION failed `test`.`v1`
|
|
rollback;
|
|
start transaction;
|
|
update v1 set c2=(select min(va.c3) from v1 va), c1=0 where c1=1;
|
|
rollback;
|
|
drop view v1;
|
|
drop table t1;
|
|
#
|
|
# Test with a temporary table
|
|
#
|
|
create temporary table t1 (c1 integer, c2 integer, c3 integer) engine=InnoDb;
|
|
insert into t1(c1,c2,c3) values (1,1,1);
|
|
insert into t1(c1,c2,c3) values (1,2,2);
|
|
insert into t1(c1,c2,c3) values (1,3,3);
|
|
insert into t1(c1,c2,c3) values (2,1,4);
|
|
insert into t1(c1,c2,c3) values (2,2,5);
|
|
insert into t1(c1,c2,c3) values (2,3,6);
|
|
insert into t1(c1,c2,c3) values (2,4,7);
|
|
insert into t1(c1,c2,c3) values (2,5,8);
|
|
start transaction;
|
|
update t1
|
|
set c1=(select a.c2
|
|
from t1 a
|
|
where a.c3 = t1.c3) limit 3;
|
|
affected rows: 2
|
|
info: Rows matched: 3 Changed: 2 Warnings: 0
|
|
select * from t1 ;
|
|
c1 c2 c3
|
|
1 1 1
|
|
2 2 2
|
|
3 3 3
|
|
2 1 4
|
|
2 2 5
|
|
2 3 6
|
|
2 4 7
|
|
2 5 8
|
|
rollback;
|
|
drop table t1;
|
|
#
|
|
# Test on dynamic columns (blob)
|
|
#
|
|
create table assets (
|
|
item_name varchar(32) primary key, -- A common attribute for all items
|
|
dynamic_cols blob -- Dynamic columns will be stored here
|
|
);
|
|
INSERT INTO assets VALUES ('MariaDB T-shirt', COLUMN_CREATE('color', 'blue', 'size', 'XL'));
|
|
INSERT INTO assets VALUES ('Thinkpad Laptop', COLUMN_CREATE('color', 'black', 'price', 500));
|
|
SELECT item_name, COLUMN_GET(dynamic_cols, 'color' as char) AS color FROM assets;
|
|
item_name color
|
|
MariaDB T-shirt blue
|
|
Thinkpad Laptop black
|
|
UPDATE assets SET dynamic_cols=COLUMN_ADD(dynamic_cols, 'warranty', '3 years') WHERE item_name='Thinkpad Laptop';
|
|
SELECT item_name, COLUMN_GET(dynamic_cols, 'warranty' as char) AS color FROM assets;
|
|
item_name color
|
|
MariaDB T-shirt NULL
|
|
Thinkpad Laptop 3 years
|
|
UPDATE assets SET dynamic_cols=COLUMN_ADD(dynamic_cols, 'warranty', '4 years')
|
|
WHERE item_name in (select b.item_name
|
|
from assets b
|
|
where COLUMN_GET(b.dynamic_cols, 'color' as char) ='black');
|
|
SELECT item_name, COLUMN_GET(dynamic_cols, 'warranty' as char) AS color FROM assets;
|
|
item_name color
|
|
MariaDB T-shirt NULL
|
|
Thinkpad Laptop 4 years
|
|
UPDATE assets SET dynamic_cols=COLUMN_ADD(dynamic_cols, 'warranty', (select COLUMN_GET(b.dynamic_cols, 'color' as char)
|
|
from assets b
|
|
where assets.item_name = item_name));
|
|
SELECT item_name, COLUMN_GET(dynamic_cols, 'warranty' as char) AS color FROM assets;
|
|
item_name color
|
|
MariaDB T-shirt blue
|
|
Thinkpad Laptop black
|
|
drop table assets ;
|
|
#
|
|
# Test on fulltext columns
|
|
#
|
|
CREATE TABLE ft2(copy TEXT,FULLTEXT(copy)) ENGINE=MyISAM;
|
|
INSERT INTO ft2(copy) VALUES
|
|
('MySQL vs MariaDB database'),
|
|
('Oracle vs MariaDB database'),
|
|
('PostgreSQL vs MariaDB database'),
|
|
('MariaDB overview'),
|
|
('Foreign keys'),
|
|
('Primary keys'),
|
|
('Indexes'),
|
|
('Transactions'),
|
|
('Triggers');
|
|
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('database');
|
|
copy
|
|
MySQL vs MariaDB database
|
|
Oracle vs MariaDB database
|
|
PostgreSQL vs MariaDB database
|
|
update ft2 set copy = (select max(concat('mykeyword ',substr(b.copy,1,5))) from ft2 b WHERE MATCH(b.copy) AGAINST('database'))
|
|
where MATCH(copy) AGAINST('keys');
|
|
SELECT * FROM ft2 WHERE MATCH(copy) AGAINST('mykeyword');
|
|
copy
|
|
mykeyword Postg
|
|
mykeyword Postg
|
|
drop table ft2;
|
|
#
|
|
# Test with MyISAM
|
|
#
|
|
create table t1 (old_c1 integer, old_c2 integer,c1 integer, c2 integer, c3 integer) engine=MyISAM;
|
|
insert t1 (c1,c2,c3) select 0,seq,seq%10 from seq_1_to_500;
|
|
insert t1 (c1,c2,c3) select 1,seq,seq%10 from seq_1_to_400;
|
|
insert t1 (c1,c2,c3) select 2,seq,seq%10 from seq_1_to_300;
|
|
insert t1 (c1,c2,c3) select 3,seq,seq%10 from seq_1_to_200;
|
|
create index t1_idx1 on t1(c3);
|
|
analyze table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 analyze status Engine-independent statistics collected
|
|
test.t1 analyze status Table is already up to date
|
|
update t1 set c1=2 where exists (select 'x' from t1);
|
|
select count(*) from t1 where c1=2;
|
|
count(*)
|
|
1400
|
|
update t1 set c1=3 where c3 in (select c3 from t1 b where t1.c3=b.c1);
|
|
select count(*) from t1 where c1=3;
|
|
count(*)
|
|
140
|
|
drop table t1;
|
|
#
|
|
# Test error on multi_update conversion on view with order by or limit
|
|
#
|
|
create table t1 (c1 integer) engine=InnoDb;
|
|
create table t2 (c1 integer) engine=InnoDb;
|
|
create view v1 as select t1.c1 as "t1c1" ,t2.c1 as "t2c1" from t1,t2 where t1.c1=t2.c1;
|
|
update v1 set t1c1=2 order by 1;
|
|
ERROR 42S22: Unknown column '1' in 'order clause'
|
|
update v1 set t1c1=2 limit 1;
|
|
drop table t1;
|
|
drop table t2;
|
|
drop view v1;
|