新建分区_云原生数据库 PolarDB(PolarDB)-阿里云帮助中心

新建分区是指在已有的分区表上新增一个分区。本文介绍了新建分区的语法及其示例。

语法说明

创建分区

ALTER TABLE <table_name> ADD PARTITION <partition_definition>;

Where partition_definition is:
        {<list_partition> | <range_partition>}

and list_partition is:
        PARTITION [<partition_name>]
          VALUES (<value>[, <value>]...)
          [TABLESPACE <tablespace_name>]
          [(<subpartition>, ...)]

and range_partition is:
        PARTITION [<partition_name>]
          VALUES LESS THAN (<value>[, <value>]...)
          [TABLESPACE <tablespace_name>]
          [(<subpartition>, ...)]

Where subpartition is:
        {<list_subpartition> | <range_subpartition> | <hash_subpartition>}

and list_subpartition is:
        SUBPARTITION [<subpartition_name>]
          VALUES (<value>[, <value>]...)
          [TABLESPACE <tablespace_name>]

and range_subpartition is:
        SUBPARTITION [<subpartition_name>]
          VALUES LESS THAN (<value>[, <value>]...)
          [TABLESPACE <tablespace_name>]

创建子分区

ALTER TABLE <table_name> MODIFY PARTITION <partition_name>
      ADD SUBPARTITION <subpartition_definition>;

Where subpartition_definition is:

{<list_subpartition> | <range_subpartition>}

and list_subpartition is:

        SUBPARTITION [<subpartition_name>]
          VALUES (<value>[, <value>]...)
          [TABLESPACE <tablespace_name>]

and range_subpartition is:

        SUBPARTITION [<subpartition_name>]
          VALUES LESS THAN (<value>[, <value>]...)
          [TABLESPACE <tablespace_name>]

示例

新建分区

新建范围分区

ALTER TABLE sales ADD PARTITION q1_2013 VALUES LESS THAN('01-APR-2013');

新建列表分区

ALTER TABLE sales ADD PARTITION east_asia VALUES ('CHINA', 'KOREA');

新建子分区

新建范围子分区

ALTER TABLE sales MODIFY PARTITION europe 
     ADD SUBPARTITION europe_2013  VALUES LESS THAN('2015-Jan-01');

新建列表子分区

ALTER TABLE sales MODIFY PARTITION second_half_2012
     ADD SUBPARTITION east_asia VALUES ('CHINA');