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