通过范围的方式进行分区, 为每个分区给出一定的范围, 范围必须是连续的并且不能重复, 使用VALUES LESS THAN操作符<br />

让我们先来创建一个range分区的表

CREATE TABLE employees (id INT NOT NULL,fname VARCHAR(30),lname VARCHAR(30),hired DATE NOT NULL DEFAULT '1970-01-01',separated DATE NOT NULL DEFAULT '9999-12-31',job_code INT NOT NULL,store_id INT NOT NULL
)
PARTITION BY RANGE (store_id) (PARTITION p0 VALUES LESS THAN (6),PARTITION p1 VALUES LESS THAN (11),PARTITION p2 VALUES LESS THAN (16),PARTITION p3 VALUES LESS THAN (21)
);

store_id 小于6的, 会被放入第一个分区, 小于11的会放入第二个分区。<br>
如果我的store_id大于21怎么办呢？, 所以我们得修改一下这个创建分区的方式。

CREATE TABLE employees (id INT NOT NULL,fname VARCHAR(30),lname VARCHAR(30),hired DATE NOT NULL DEFAULT '1970-01-01',separated DATE NOT NULL DEFAULT '9999-12-31',job_code INT NOT NULL,store_id INT NOT NULL
)
PARTITION BY RANGE (store_id) (PARTITION p0 VALUES LESS THAN (6),PARTITION p1 VALUES LESS THAN (11),PARTITION p2 VALUES LESS THAN (16),PARTITION p3 VALUES LESS THAN (21),PARTITION p4 VALUES LESS THAN (MAXVALUE)
);

增加了一个MAXVALUE, MAXVALUE的意思是, 大于21的数据都会放入这个分区, 当然, 还有另外一种方式去避免这个问题, 就是在INSERT的时候增加IGNORE关键字。<br />

分区键类型为时间转时间戳 <br />
可以使用UNIX-TIMESTAMP()

CREATE TABLE quarterly_report_status (report_id INT NOT NULL,report_status VARCHAR(20) NOT NULL,report_updated TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)
PARTITION BY RANGE ( UNIX_TIMESTAMP(report_updated) ) (PARTITION p0 VALUES LESS THAN ( UNIX_TIMESTAMP('2008-01-01 00:00:00') ),PARTITION p1 VALUES LESS THAN ( UNIX_TIMESTAMP('2008-04-01 00:00:00') ),PARTITION p2 VALUES LESS THAN ( UNIX_TIMESTAMP('2008-07-01 00:00:00') ),PARTITION p3 VALUES LESS THAN ( UNIX_TIMESTAMP('2008-10-01 00:00:00') ),PARTITION p4 VALUES LESS THAN ( UNIX_TIMESTAMP('2009-01-01 00:00:00') ),PARTITION p5 VALUES LESS THAN ( UNIX_TIMESTAMP('2009-04-01 00:00:00') ),PARTITION p6 VALUES LESS THAN ( UNIX_TIMESTAMP('2009-07-01 00:00:00') ),PARTITION p7 VALUES LESS THAN ( UNIX_TIMESTAMP('2009-10-01 00:00:00') ),PARTITION p8 VALUES LESS THAN ( UNIX_TIMESTAMP('2010-01-01 00:00:00') ),PARTITION p9 VALUES LESS THAN (MAXVALUE)
);

除了UNIX_TIMESTAMP外,其他涉及到时间戳的表达式都是不被允许的

基于时间数字的分区 <br />

CREATE TABLE members (firstname VARCHAR(25) NOT NULL,lastname VARCHAR(25) NOT NULL,username VARCHAR(16) NOT NULL,email VARCHAR(35),joined DATE NOT NULL
)
PARTITION BY RANGE(YEAR(joined) ) (PARTITION p0 VALUES LESS THAN (1960),PARTITION p1 VALUES LESS THAN (1970),PARTITION p2 VALUES LESS THAN (1980),PARTITION p3 VALUES LESS THAN (1990),PARTITION p4 VALUES LESS THAN MAXVALUE
);

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