2005-12-22 10:29:00 +01:00
|
|
|
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
|
|
|
|
|
create table t1 ( a int not null) partition by hash(a) partitions 2;
|
|
|
|
|
insert into t1 values (1),(2),(3);
|
|
|
|
|
explain select * from t1 where a=5 and a=6;
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
|
|
|
|
|
drop table t1;
|
|
|
|
|
create table t1 (
|
|
|
|
|
a int(11) not null
|
|
|
|
|
) partition by hash (a) partitions 2;
|
|
|
|
|
insert into t1 values (1),(2),(3);
|
|
|
|
|
explain partitions select * from t1 where a=1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t1 where a=2;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t1 where a=1 or a=2;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
create table t2 (
|
|
|
|
|
a int not null,
|
|
|
|
|
b int not null
|
|
|
|
|
) partition by key(a,b) partitions 2;
|
|
|
|
|
insert into t2 values (1,1),(2,2),(3,3);
|
|
|
|
|
explain partitions select * from t2 where a=1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t2 p0,p1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t2 where b=1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t2 p0,p1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t2 where a=1 and b=1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t2 p0 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
create table t3 (
|
|
|
|
|
a int
|
|
|
|
|
)
|
|
|
|
|
partition by range (a*1) (
|
|
|
|
|
partition p0 values less than (10),
|
|
|
|
|
partition p1 values less than (20)
|
|
|
|
|
);
|
|
|
|
|
insert into t3 values (5),(15);
|
|
|
|
|
explain partitions select * from t3 where a=11;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t3 p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t3 where a=10;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t3 p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t3 where a=20;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
explain partitions select * from t3 where a=30;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
create table t4 (a int not null, b int not null) partition by LIST (a+b) (
|
|
|
|
|
partition p0 values in (12),
|
|
|
|
|
partition p1 values in (14)
|
|
|
|
|
);
|
|
|
|
|
insert into t4 values (10,2), (10,4);
|
|
|
|
|
explain partitions select * from t4 where (a=10 and b=1) or (a=10 and b=2);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t4 p0 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t4
|
|
|
|
|
where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t4 p0 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t4 where (a=10 and b=2) or (a=10 and b=3)
|
|
|
|
|
or (a=10 and b = 4);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t4 where (a=10 and b=1) or a=11;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t4 where (a=10 and b=2) or a=11;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t4 p0,p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
drop table t1, t2, t3, t4;
|
|
|
|
|
create table t5 (a int not null, b int not null,
|
|
|
|
|
c int not null, d int not null)
|
|
|
|
|
partition by LIST(a+b) subpartition by HASH (c+d) subpartitions 2
|
|
|
|
|
(
|
|
|
|
|
partition p0 values in (12),
|
|
|
|
|
partition p1 values in (14)
|
|
|
|
|
);
|
|
|
|
|
insert into t5 values (10,2,0,0), (10,4,0,0), (10,2,0,1), (10,4,0,1);
|
|
|
|
|
explain partitions select * from t5;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp0,p0_sp1,p1_sp0,p1_sp1 ALL NULL NULL NULL NULL 4
|
|
|
|
|
explain partitions select * from t5
|
|
|
|
|
where (a=10 and b=1) or (a=10 and b=2) or (a=10 and b = 3);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp0,p0_sp1 ALL NULL NULL NULL NULL 4 Using where
|
|
|
|
|
explain partitions select * from t5 where (a=10 and b=2) or (a=10 and b=3)
|
|
|
|
|
or (a=10 and b = 4);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp0,p0_sp1,p1_sp0,p1_sp1 ALL NULL NULL NULL NULL 4 Using where
|
|
|
|
|
explain partitions select * from t5 where (c=1 and d=1);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp0,p1_sp0 ALL NULL NULL NULL NULL 4 Using where
|
|
|
|
|
explain partitions select * from t5 where (c=2 and d=1);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp1,p1_sp1 ALL NULL NULL NULL NULL 4 Using where
|
|
|
|
|
explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or
|
|
|
|
|
(c=2 and d=1);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp0,p0_sp1,p1_sp1 ALL NULL NULL NULL NULL 4 Using where
|
|
|
|
|
explain partitions select * from t5 where (a=10 and b=2 and c=1 and d=1) or
|
|
|
|
|
(b=2 and c=2 and d=1);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t5 p0_sp0,p0_sp1,p1_sp1 ALL NULL NULL NULL NULL 4 Using where
|
|
|
|
|
create table t6 (a int not null) partition by LIST(a) (
|
|
|
|
|
partition p1 values in (1),
|
|
|
|
|
partition p3 values in (3),
|
|
|
|
|
partition p5 values in (5),
|
|
|
|
|
partition p7 values in (7),
|
|
|
|
|
partition p9 values in (9)
|
|
|
|
|
);
|
|
|
|
|
insert into t6 values (1),(3),(5);
|
|
|
|
|
explain partitions select * from t6 where a < 1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
explain partitions select * from t6 where a <= 1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a > 9;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
explain partitions select * from t6 where a >= 9;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p9 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a > 0 and a < 5;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p1,p3 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a > 5 and a < 12;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p7,p9 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a > 3 and a < 8 ;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p5,p7 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a >= 0 and a <= 5;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p1,p3,p5 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a >= 5 and a <= 12;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p5,p7,p9 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a >= 3 and a <= 8;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t6 p3,p5,p7 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t6 where a > 3 and a < 5;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
create table t7 (a int not null) partition by RANGE(a) (
|
|
|
|
|
partition p10 values less than (10),
|
|
|
|
|
partition p30 values less than (30),
|
|
|
|
|
partition p50 values less than (50),
|
|
|
|
|
partition p70 values less than (70),
|
|
|
|
|
partition p90 values less than (90)
|
|
|
|
|
);
|
|
|
|
|
insert into t7 values (10),(30),(50);
|
|
|
|
|
explain partitions select * from t7 where a < 5;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t7 p10 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t7 where a < 10;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t7 p10 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t7 where a <= 10;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t7 p10,p30 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t7 where a = 10;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t7 p30 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t7 where a < 90;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t7 p10,p30,p50,p70,p90 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t7 where a = 90;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
explain partitions select * from t7 where a > 90;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
explain partitions select * from t7 where a >= 90;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
explain partitions select * from t7 where a > 11 and a < 29;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t7 p30 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
create table t8 (a date not null) partition by RANGE(YEAR(a)) (
|
|
|
|
|
partition p0 values less than (1980),
|
|
|
|
|
partition p1 values less than (1990),
|
|
|
|
|
partition p2 values less than (2000)
|
|
|
|
|
);
|
|
|
|
|
insert into t8 values ('1985-05-05'),('1995-05-05');
|
|
|
|
|
explain partitions select * from t8 where a < '1980-02-02';
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t8 p0,p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
create table t9 (a date not null) partition by RANGE(TO_DAYS(a)) (
|
|
|
|
|
partition p0 values less than (732299), -- 2004-12-19
|
|
|
|
|
partition p1 values less than (732468), -- 2005-06-06
|
|
|
|
|
partition p2 values less than (732664) -- 2005-12-19
|
|
|
|
|
);
|
|
|
|
|
insert into t9 values ('2005-05-05'), ('2005-04-04');
|
|
|
|
|
explain partitions select * from t9 where a < '2004-12-19';
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t9 p0 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t9 where a <= '2004-12-19';
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t9 p0,p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
drop table t5,t6,t7,t8,t9;
|
|
|
|
|
create table t1 (a enum('a','b','c','d') default 'a')
|
|
|
|
|
partition by hash (ascii(a)) partitions 2;
|
|
|
|
|
insert into t1 values ('a'),('b'),('c');
|
|
|
|
|
explain partitions select * from t1 where a='b';
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
drop table t1;
|
2005-12-26 06:40:09 +01:00
|
|
|
create table t1 (
|
|
|
|
|
a1 int not null
|
|
|
|
|
)
|
|
|
|
|
partition by range (a1) (
|
|
|
|
|
partition p0 values less than (3),
|
|
|
|
|
partition p1 values less than (6),
|
|
|
|
|
partition p2 values less than (9)
|
|
|
|
|
);
|
|
|
|
|
insert into t1 values (1),(2),(3);
|
|
|
|
|
explain partitions select * from t1 where a1 > 3;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t1 where a1 >= 3;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t1 where a1 < 3 and a1 > 3;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
|
|
|
|
drop table t1;
|
|
|
|
|
create table t3 (a int, b int)
|
|
|
|
|
partition by list(a) subpartition by hash(b) subpartitions 4 (
|
|
|
|
|
partition p0 values in (1),
|
|
|
|
|
partition p1 values in (2),
|
|
|
|
|
partition p2 values in (3),
|
|
|
|
|
partition p3 values in (4)
|
|
|
|
|
);
|
|
|
|
|
insert into t3 values (1,1),(2,2),(3,3);
|
|
|
|
|
explain partitions select * from t3 where a=2 or b=1;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t3 p0_sp1,p1_sp0,p1_sp1,p1_sp2,p1_sp3,p2_sp1,p3_sp1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t3 where a=4 or b=2;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t3 p0_sp2,p1_sp2,p2_sp2,p3_sp0,p3_sp1,p3_sp2,p3_sp3 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
explain partitions select * from t3 where (a=2 or b=1) and (a=4 or b=2) ;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t3 p1_sp2,p3_sp1 ALL NULL NULL NULL NULL 3 Using where
|
2005-12-26 08:16:36 +01:00
|
|
|
drop table t3;
|
2005-12-26 06:40:09 +01:00
|
|
|
create table t1 (a int) partition by hash(a) partitions 2;
|
|
|
|
|
insert into t1 values (1),(2);
|
|
|
|
|
explain partitions select * from t1 where a is null;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p0 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
explain partitions select * from t1 where a is not null;
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
drop table t1;
|
2005-12-29 07:32:46 +01:00
|
|
|
create table t1 (a int not null, b int not null, key(a), key(b))
|
|
|
|
|
partition by hash(a) partitions 4;
|
|
|
|
|
insert into t1 values (1,1),(2,2),(3,3),(4,4);
|
|
|
|
|
explain partitions
|
|
|
|
|
select * from t1 X, t1 Y
|
|
|
|
|
where X.b = Y.b and (X.a=1 or X.a=2) and (Y.a=2 or Y.a=3);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE X p1,p2 ALL a,b NULL NULL NULL 4 Using where
|
|
|
|
|
1 SIMPLE Y p2,p3 ref a,b b 4 test.X.b 2 Using where
|
|
|
|
|
explain partitions
|
|
|
|
|
select * from t1 X, t1 Y where X.a = Y.a and (X.a=1 or X.a=2);
|
|
|
|
|
id select_type table partitions type possible_keys key key_len ref rows Extra
|
|
|
|
|
1 SIMPLE X p1,p2 ALL a NULL NULL NULL 4 Using where
|
|
|
|
|
1 SIMPLE Y p1,p2 ref a a 4 test.X.a 2
|
|
|
|
|
drop table t1;
|
