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DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
TRUNCATE TABLE t1;
INSERT INTO t1 (a,b) VALUES (1,'a'), (2,'b'), (3,'c');
TRUNCATE TABLE t1;
SELECT a,b FROM t1;
a b
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN> KEY AUTO_INCREMENT, c <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> DEFAULT CHARSET=latin1
PARTITION BY HASH (`a`)
PARTITIONS 2
INSERT INTO t1 (c) VALUES ('a'),('b'),('c');
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
PARTITION BY HASH (`a`)
PARTITIONS 2
TRUNCATE TABLE t1;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> DEFAULT CHARSET=latin1
PARTITION BY HASH (`a`)
PARTITIONS 2
INSERT INTO t1 (c) VALUES ('d');
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL AUTO_INCREMENT,
`c` char(8) DEFAULT NULL,
PRIMARY KEY (`a`)
) ENGINE=<STORAGE_ENGINE> AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
PARTITION BY HASH (`a`)
PARTITIONS 2
SELECT a,c FROM t1;
a c
1 d
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(2,'d'),(4,'e'),(100,'f'),(101,'g');
ALTER TABLE t1 TRUNCATE PARTITION p0;
SELECT a,b FROM t1;
a b
1 a
101 g
3 c
EXPLAIN PARTITIONS SELECT a,b FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # #
INSERT INTO t1 (a,b) VALUES (1,'a'), (2,'b'), (3,'c');
ALTER TABLE t1 TRUNCATE PARTITION ALL;
SELECT a,b FROM t1;
a b
DROP TABLE t1;
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