SELECT PARTITION_NAME,TABLE_ROWS FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_NAME = 'xw_user_applyloan_baoxian';   SELECT count(id) as sum ,FROM_UNIXTIME(time, '%Y-%m') as date FROM `xw_user_applyloan_baoxian` GROUP BY date ORDER BY date desc ;   //时间戳 alter table xw_user_applyloan_baoxian algorithm=inplace, lock=none, drop primary key, add primary key (id, time); alter table xw_user_applyloan_baoxian partition by range columns (time) (     partition p1711 values less than (1512057599),     partition p1712 values less than (1514735999),     partition p0 values less than maxvalue );   //字符串 alter table xw_user_applyloan_baoxian algorithm=inplace, lock=none, drop primary key, add primary key (id, time); alter table xw_user_applyloan_baoxian partition by range columns (UNIX_TIMESTAMP(time）) (     partition p1711 values less than (UNIX_TIMESTAMP('2007-11-30 23:59:59')),     partition p1712 values less than (UNIX_TIMESTAMP('2007-12-31 23:59:59')),     partition p0 values less than maxvalue );