mysql - 根据触发器中的子查询计算值

Question

我想在 MySql 中创建一个触发器以在表 A 中插入一些值，如果记录已存在，我想重新计算其中一个字段，但我不断收到语法错误:

1064 - 您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在 'P1

附近使用的正确语法

内连接(第 6 行选择 SUM(ATS) AS TOTAGAINST, TOURNID, HOMETEAM, ROUNDID'

这是我的代码(为了调试而删除):

DROP TRIGGER IF EXISTS `trig_matches_insert`;
DELIMITER //
CREATE TRIGGER `trig_matches_insert` AFTER INSERT ON `matches`
 FOR EACH ROW
BEGIN 
 INSERT INTO  positions (TEAMID, SC_AGAINST, SC_FOR, ROUNDID, TOURNID) values       
(new.HOMETEAM, new.ATS, new.HTS, new.ROUNDID, new.TOURNID)
ON DUPLICATE KEY 
UPDATE positions P1
INNER JOIN 
(
 SELECT SUM(ATS) AS TOTAGAINST, TOURNID, HOMETEAM, ROUNDID FROM matches GROUP BY  
 TOURNID,HOMETEAM, ROUNDID
) P2 ON P2.HOMETEAM = P1.TEAMID AND P2.TOURNID = P1.TOURNID AND P2.ROUNDID = P1.ROUNDID
SET P1.SC_AGAINST = P2.TOTAGAINST WHERE P1.ID = 10;
END
//
DELIMITER ;

我不知道这里出了什么问题..当我独立运行更新查询时，它运行良好

这里有一些支持的sql:

CREATE TABLE IF NOT EXISTS `matches` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `TOURNID` int(11) NOT NULL,
  `HOMETEAM` int(11) NOT NULL,
  `AWAYTEAM` int(11) NOT NULL,
  `HTS` decimal(10,0) NOT NULL,
  `ATS` decimal(10,0) NOT NULL,
  `FIELD` text NOT NULL,
  `TIME` datetime NOT NULL,
  `ROUNDID` int(11) NOT NULL,
  PRIMARY KEY (`ID`),
  KEY `TOURNID` (`TOURNID`),
  KEY `HOMETEAM` (`HOMETEAM`),
  KEY `AWAYTEAM` (`AWAYTEAM`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=20 ;

INSERT INTO `matches` (`ID`, `TOURNID`, `HOMETEAM`, `AWAYTEAM`, `HTS`, `ATS`, `FIELD`, `TIME`, `ROUNDID`) VALUES
(17, 1, 30, 31, '2', '3', '', '2015-01-04 00:00:00', 1),
(18, 1, 30, 3, '2', '4', '', '2015-01-04 00:00:00', 1),
(19, 1, 30, 4, '3', '5', '', '2015-01-04 00:00:00', 1);

CREATE TABLE IF NOT EXISTS `positions` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `TOURNID` int(11) NOT NULL,
  `TEAMID` int(11) NOT NULL,
  `ROUNDID` int(11) NOT NULL,
  `SC_FOR` decimal(10,0) NOT NULL,
  `SC_AGAINST` decimal(10,0) NOT NULL,
  `POULEID` int(11) NOT NULL,
  PRIMARY KEY (`ID`),
  UNIQUE KEY `TOURNID_2` (`TOURNID`,`TEAMID`,`ROUNDID`),
  KEY `TOURNID` (`TOURNID`,`TEAMID`),
  KEY `TEAMID` (`TEAMID`),
  KEY `ROUND` (`ROUNDID`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=15 ;

   INSERT INTO `positions` (`ID`, `TOURNID`, `TEAMID`, `ROUNDID`, `SC_FOR`, `SC_AGAINST`, `POULEID`) VALUES
(10, 1, 30, 1, '2', '12', 0);

提前致谢

迈克

Answer 1

我想我已经找到了它，看起来在 ON DUPLICATE KEY 之后，位置表已经获得了范围，不需要从头开始构建和更新语句，似乎快速选择就可以了:

DROP TRIGGER IF EXISTS `matches_after_ins_trig`;
DELIMITER //
CREATE TRIGGER `matches_after_ins_trig` AFTER INSERT ON `matches`
FOR EACH ROW
BEGIN 
INSERT INTO  positions (TEAMID, SC_AGAINST, SC_FOR, ROUNDID, TOURNID) values     (new.HOMETEAM, new.ATS, new.HTS, new.ROUNDID, new.TOURNID)
ON DUPLICATE KEY UPDATE SC_AGAINST = (SELECT SUM(ATS) FROM matches WHERE  
matches.HOMETEAM = new.HOMETEAM AND matches.TOURNID = new.TOURNID AND
matches.ROUNDID = new.ROUNDID GROUP BY TOURNID,HOMETEAM, ROUNDID);
END