子分区（Subpartitioning）是对已分区的分区表再次分区，又称为复合分区（Composite Partitioning）。

RANGE / LIST à HASH / KEY

CREATE TABLE ts (id INT ,purchased DATE)

????PARTITION BY RANGE(YEAR(purchased))

????SUBPARTITION BY HASH(TO_DAYS(purchased))

????SUBPARTITIONS 2

????(

????PARTITION p0 VALUES LESS THAN (1990),

????PARTITION p1 VALUES LESS THAN (2000),

????PARTITION p3 VALUES LESS THAN MAXVALUE

????);

?

（子分区）复合分区用于保存非常大量的数据：

1. 每个分区必须有相同数量的子分区。
2. 如果要显示指定子分区，则每个分区都要显示指定。
3. 子分区的名称在整个表中是唯一的。

CREATE TABLE ts1 (id INT ,purchased DATE)

????PARTITION BY RANGE(YEAR(purchased))

????SUBPARTITION BY HASH(TO_DAYS(purchased))

????(

????PARTITION p0 VALUES LESS THAN (1990)(SUBPARTITION s0,SUBPARTITION s1),

????PARTITION p1 VALUES LESS THAN (2000)(SUBPARTITION s2,SUBPARTITION s3),

????PARTITION p3 VALUES LESS THAN MAXVALUE(SUBPARTITION s4,SUBPARTITION s5)

????)；

MySQL中的分区（七）子分区(复合分区)