Mysql --------------------------------------------------------------------------------

-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ------------------------------+------+------------------------------------------ --------+--------------+---------+------+------+-------------------------------- + |1 |主| |空 |全部|空|空|空|空| 358 || |1 |主| |空

 mData | CREATE TABLE `mData` (
   `m1` mediumint(8) unsigned DEFAULT NULL,
   `m2` smallint(5) unsigned DEFAULT NULL,
   `m3` bigint(20) DEFAULT NULL,
   `m4` tinyint(4) DEFAULT NULL,
   `m5` date DEFAULT NULL,
   KEY `m_m1` (`m1`) USING HASH,
   KEY `m_date` (`m5`),
   KEY `m_m2` (`m2`),
   KEY `m_combined` (`m1`,`m2`,`m5`),
   KEY `m1_tradeday` (`m1`,`m5`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci
 /*!50100 PARTITION BY RANGE ( YEAR(m5))
 SUBPARTITION BY HASH (MONTH(m5))
 (PARTITION p2013 VALUES LESS THAN (2014)
  (SUBPARTITION dec_2013 ENGINE = InnoDB,
   SUBPARTITION jan_2013 ENGINE = InnoDB,
   SUBPARTITION feb_2013 ENGINE = InnoDB,
   SUBPARTITION mar_2013 ENGINE = InnoDB,
   SUBPARTITION apr_2013 ENGINE = InnoDB,
   SUBPARTITION may_2013 ENGINE = InnoDB,
   SUBPARTITION jun_2013 ENGINE = InnoDB,
   SUBPARTITION jul_2013 ENGINE = InnoDB,
   SUBPARTITION aug_2013 ENGINE = InnoDB,
   SUBPARTITION sep_2013 ENGINE = InnoDB,
   SUBPARTITION oct_2013 ENGINE = InnoDB,
  SUBPARTITION nov_2013 ENGINE = InnoDB),
  PARTITION p2014 VALUES LESS THAN (2015)
  (SUBPARTITION dec_2014 ENGINE = InnoDB,
   SUBPARTITION jan_2014 ENGINE = InnoDB,
   SUBPARTITION feb_2014 ENGINE = InnoDB,
   SUBPARTITION mar_2014 ENGINE = InnoDB,
   SUBPARTITION apr_2014 ENGINE = InnoDB,
   SUBPARTITION may_2014 ENGINE = InnoDB,
   SUBPARTITION jun_2014 ENGINE = InnoDB,
   SUBPARTITION jul_2014 ENGINE = InnoDB,
   SUBPARTITION aug_2014 ENGINE = InnoDB,
   SUBPARTITION sep_2014 ENGINE = InnoDB,
   SUBPARTITION oct_2014 ENGINE = InnoDB,
   SUBPARTITION nov_2014 ENGINE = InnoDB),
  PARTITION p2015 VALUES LESS THAN (2016)
  (SUBPARTITION dec_2015 ENGINE = InnoDB,
   SUBPARTITION jan_2015 ENGINE = InnoDB,
   SUBPARTITION feb_2015 ENGINE = InnoDB,
   SUBPARTITION mar_2015 ENGINE = InnoDB,
   SUBPARTITION apr_2015 ENGINE = InnoDB,
   SUBPARTITION may_2015 ENGINE = InnoDB,
   SUBPARTITION jun_2015 ENGINE = InnoDB,
   SUBPARTITION jul_2015 ENGINE = InnoDB,
   SUBPARTITION aug_2015 ENGINE = InnoDB,
   SUBPARTITION sep_2015 ENGINE = InnoDB,
   SUBPARTITION oct_2015 ENGINE = InnoDB,
   SUBPARTITION nov_2015 ENGINE = InnoDB),
  PARTITION p2016 VALUES LESS THAN (2017)
  (SUBPARTITION dec_2016 ENGINE = InnoDB,
   SUBPARTITION jan_2016 ENGINE = InnoDB,
   SUBPARTITION feb_2016 ENGINE = InnoDB,
   SUBPARTITION mar_2016 ENGINE = InnoDB,
   SUBPARTITION apr_2016 ENGINE = InnoDB,
   SUBPARTITION may_2016 ENGINE = InnoDB,
   SUBPARTITION jun_2016 ENGINE = InnoDB,
   SUBPARTITION jul_2016 ENGINE = InnoDB,
   SUBPARTITION aug_2016 ENGINE = InnoDB,
   SUBPARTITION sep_2016 ENGINE = InnoDB,
   SUBPARTITION oct_2016 ENGINE = InnoDB,
   SUBPARTITION nov_2016 ENGINE = InnoDB),
  PARTITION pmax VALUES LESS THAN MAXVALUE
  (SUBPARTITION dec_max ENGINE = InnoDB,
   SUBPARTITION jan_max ENGINE = InnoDB,
   SUBPARTITION feb_max ENGINE = InnoDB,
   SUBPARTITION mar_max ENGINE = InnoDB,
   SUBPARTITION apr_max ENGINE = InnoDB,
   SUBPARTITION may_max ENGINE = InnoDB,
   SUBPARTITION jun_max ENGINE = InnoDB,
   SUBPARTITION jul_max ENGINE = InnoDB,
   SUBPARTITION aug_max ENGINE = InnoDB,
   SUBPARTITION sep_max ENGINE = InnoDB,
   SUBPARTITION oct_max ENGINE = InnoDB,
   SUBPARTITION nov_max ENGINE = InnoDB)) */ |

update mData as a join (select * from mData
                        where m1 = 326 and m5 = '2015-   07-06' ) as b
            on  a.m5 > b.m5 and a.m1 = b.m1
            and a.m2 = b.m2 and a.m3 = b.m3
    set a.m4 = 0;

explain partitions (select * from (select * from mData where m1 = 326) as a join (select * from mData where m1 = 326 and m5= '2015-07-06') as b on  a.m5 > b.m5 and a.m1 = b.m1 and a.m2 = b.m2 and a.m3 = b.m3 and a.m5 > '2015-07-06');

EXPLAIN PARTITIONS select * from ccass_data where sid = 326 and trade_day = '2015-07-06';

| id | select_type | table      | partitions     | type | possible_keys                                    | key          | key_len | ref         | rows | Extra       |
 +----+-------------+------------+----------------+------+--------------------------------------------------+--------------+---------+-------------+------+-------------+
 |  1 | SIMPLE      | mData     | p2015_jul_2015 | ref  | m_m1,m_m5,m_combined,m1_m5               | m1_m5 | 8    | const,const |  357    | Using where        |

KEY `m_m1` (`m1`)