Mysql update inner join

A: demand
the same table structure of Table A and Table B, A table is a history table, B is an incremental table data sheet; A wants to update the data table based on the associated conditions.

二：表结构
CREATE TABLE `A` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `bid` bigint(20) NOT NULL ,
  `sid` bigint(20) NOT NULL ,
  `grid` bigint(20) NOT NULL ,
  `age` bigint(20) NOT NULL ,
  `pv` bigint(20) NOT NULL ,
  `uv` bigint(20) NOT NULL ,
  `pay_count` bigint(20) NOT NULL,
  `charge_amount` bigint(20) NOT NULL ,
  `last_pay_count` bigint(20) NOT NULL ,
  `last_charge_amount` bigint(20) NOT NULL ,
  `ftime` bigint(20) NOT NULL ,
  `dtime` bigint(20) NOT NULL DEFAULT '0' COMMENT '详细时间(yyyyMMddHH)'
  PRIMARY KEY (`id`,`ftime`),
  KEY `IX_FTIME` (`ftime`) USING BTREE,
  KEY `IX_HTIME` (`htime`) USING BTREE,
  KEY `IX_DTIME` (`dtime`),
  KEY `IX_B_F_S_G` (`bid`,`ftime`,`sid`,`grid`),
  KEY `IX_B_S_G` (`bid`,`sid`,`grid`),
  KEY `IX_B_D_S` (`bid`,`dtime`,`sid`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8;
注意：mysql 只有2种索引(BTREE 和 HASH)

III: Note
1, Table A only updates some fields: pv, uv and pay_amount

2, to determine a unique record associated fields are: bid, sid, dtime, qrid

 

Four: to achieve
1, realized using inner join

UPDATE A as aa
INNER JOIN B as bb ON bb.bid = aa.bid
AND bb.sid=aa.sid
AND bb.grid=aa.grid
SET aa.pv=bb.pv,
aa.uv=bb.uv,
aa.pay_amount=bb.pay_amount
WHERE aa.dtime=?
AND aa.bid=? ;
2、使用exists实现

UPDATE A aa
SET aa.pv = (SELECT bb.pv
FROM B bb
WHERE bb.bid = aa.bid
AND bb.sid = aa.sid
AND bb.grid = aa.grid),
aa.uv = (SELECT bb.uv
FROM B bb
WHERE bb.bid = aa.bid
AND bb.sid = aa.sid
AND bb.grid = aa.grid),
aa.pay_amount = (SELECT bb.pay_amount
FROM B bb
WHERE bb.bid = aa.bid
AND bb.sid = aa.sid
AND bb.grid = aa.grid)
WHERE EXISTS (SELECT 1
FROM B bb
WHERE bb.bid = aa.bid
AND bb.sid = aa.sid
AND bb.grid = aa.grid)
AND aa.dtime = ?
AND aa.bid = ?;