Mysql分区表相信大家都有一些了解，下面就为您介绍Mysql分区表对于唯一约束的局限性，如果您对此相关内容感兴趣，随我看来。。
Mysql分区表关于Partitioning Keys, Primary Keys, and Unique Keys的限制
在5.1中Mysql分区表对唯一约束有明确的规定，每一个唯一约束必须包含在分区表的分区键（也包括主键约束）。
这句话也许不好理解，我们做几个实验：
CREATE TABLE t1 ( id INT NOT NULL, uid INT NOT NULL, PRIMARY KEY (id) ) PARTITION BY RANGE (id) (PARTITION p0 VALUES LESS THAN(5) ENGINE = INNODB, PARTITION p1 VALUES LESS THAN(10) ENGINE = INNODB); CREATE TABLE t1 ( id INT NOT NULL, uid INT NOT NULL, PRIMARY KEY (id) ) PARTITION BY RANGE (id) (PARTITION p0 VALUES LESS THAN(5) ENGINE = MyISAM DATA DIRECTORY='/tmp' INDEX DIRECTORY='/tmp', PARTITION p1 VALUES LESS THAN(10) ENGINE = MyISAM DATA DIRECTORY='/tmp' INDEX DIRECTORY='/tmp'); mysql> CREATE TABLE t1 -> ( id INT NOT NULL, -> uid INT NOT NULL, -> PRIMARY KEY (id), -> UNIQUE KEY (uid) -> ) -> PARTITION BY RANGE (id) -> (PARTITION p0 VALUES LESS THAN(5), -> PARTITION p1 VALUES LESS THAN(10) -> );ERROR 1503 (HY000): A UNIQUE INDEX must include all columns in the table's partitioning function