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drop table if exists t1;
CREATE TABLE t1 (c1 INT)
PARTITION BY HASH (c1)
PARTITIONS 15;
INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
ALTER TABLE t1 COALESCE PARTITION 13;
DROP TABLE t1;
CREATE TABLE t1 (c1 INT)
PARTITION BY LINEAR HASH (c1)
PARTITIONS 5;
INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
ALTER TABLE t1 COALESCE PARTITION 3;
DROP TABLE t1;
create table t1 (a int unsigned)
partition by hash(a div 2)
partitions 4;
insert into t1 values (null),(0),(1),(2),(3),(4),(5),(6),(7);
select * from t1 where a < 0;
a
select * from t1 where a is null or (a >= 5 and a <= 7);
a
NULL
5
6
7
select * from t1 where a is null;
a
NULL
select * from t1 where a is not null;
a
0
1
2
3
4
5
6
7
select * from t1 where a >= 1 and a < 3;
a
1
2
select * from t1 where a >= 3 and a <= 5;
a
3
4
5
select * from t1 where a > 2 and a < 4;
a
3
select * from t1 where a > 3 and a <= 6;
a
4
5
6
select * from t1 where a > 5;
a
6
7
select * from t1 where a >= 1 and a <= 5;
a
1
2
3
4
5
explain partitions select * from t1 where a < 0;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1,p2,p3 ALL NULL NULL NULL NULL 9 Using where
explain partitions select * from t1 where a is null or (a >= 5 and a <= 7);
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p2,p3 ALL NULL NULL NULL NULL 7 Using where
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 3 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,p2,p3 ALL NULL NULL NULL NULL 9 Using where
explain partitions select * from t1 where a >= 1 and a < 3;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 ALL NULL NULL NULL NULL 5 Using where
explain partitions select * from t1 where a >= 3 and a <= 5;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1,p2 ALL NULL NULL NULL NULL 4 Using where
explain partitions select * from t1 where a > 2 and a < 4;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1 ALL NULL NULL NULL NULL 2 Using where
explain partitions select * from t1 where a > 3 and a <= 6;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p2,p3 ALL NULL NULL NULL NULL 4 Using where
explain partitions select * from t1 where a > 5;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1,p2,p3 ALL NULL NULL NULL NULL 9 Using where
explain partitions select * from t1 where a >= 1 and a <= 5;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1,p2 ALL NULL NULL NULL NULL 7 Using where
drop table t1;
CREATE TABLE t1 (
a int not null,
b int not null,
c int not null,
primary key(a,b))
partition by hash (a + 2)
partitions 3
(partition x1 tablespace ts1,
partition x2 tablespace ts2,
partition x3 tablespace ts3);
insert into t1 values (1,1,1);
insert into t1 values (2,1,1);
insert into t1 values (3,1,1);
insert into t1 values (4,1,1);
insert into t1 values (5,1,1);
select * from t1;
a b c
1 1 1
4 1 1
2 1 1
5 1 1
3 1 1
update t1 set c=3 where b=1;
select * from t1;
a b c
1 1 3
4 1 3
2 1 3
5 1 3
3 1 3
select b from t1 where a=3;
b
1
select b,c from t1 where a=1 AND b=1;
b c
1 3
delete from t1 where a=1;
delete from t1 where c=3;
select * from t1;
a b c
ALTER TABLE t1
partition by hash (a + 3)
partitions 3
(partition x1 tablespace ts1,
partition x2 tablespace ts2,
partition x3 tablespace ts3);
select * from t1;
a b c
drop table t1;
CREATE TABLE t1 (
a int not null,
b int not null,
c int not null,
primary key(a,b))
partition by hash (a)
(partition x1);
drop table t1;
CREATE TABLE t1 (
a int not null,
b int not null,
c int not null,
primary key(a,b))
partition by key (a)
(partition x1);
drop table t1;
CREATE TABLE t1 (f1 INTEGER, f2 char(20)) ENGINE = 'MYISAM' PARTITION BY HASH(f1) PARTITIONS 2;
INSERT INTO t1 SET f1 = 0 - 1, f2 = '#######';
select * from t1;
f1 f2
-1 #######
drop table t1;
CREATE TABLE t1 (s1 int) ENGINE=BLACKHOLE PARTITION BY HASH (s1);
INSERT INTO t1 VALUES (0);
DROP TABLE t1;
create table t1 (c1 int DEFAULT NULL,
c2 varchar (30) DEFAULT NULL,
c3 date DEFAULT NULL)
engine = myisam
partition by hash (to_days(c3))
partitions 12;
insert into t1 values
(136,'abc','2002-01-05'),(142,'abc','2002-02-14'),(162,'abc','2002-06-28'),
(182,'abc','2002-11-09'),(158,'abc','2002-06-01'),(184,'abc','2002-11-22');
select * from t1;
c1 c2 c3
136 abc 2002-01-05
158 abc 2002-06-01
142 abc 2002-02-14
162 abc 2002-06-28
182 abc 2002-11-09
184 abc 2002-11-22
select * from t1 where c3 between '2002-01-01' and '2002-12-31';
c1 c2 c3
136 abc 2002-01-05
158 abc 2002-06-01
142 abc 2002-02-14
162 abc 2002-06-28
182 abc 2002-11-09
184 abc 2002-11-22
drop table t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM PARTITION BY HASH(c1) PARTITIONS 1;
INSERT DELAYED INTO t1 VALUES (1);
DROP TABLE t1;
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