我將使用存儲在table_b中的變量更新table_a。但是當我嘗試更新與選擇查詢,我有錯誤,請幫助我。萬分感謝。使用mysql中的select進行更新
這2代表的結構:
CREATE TABLE IF NOT EXISTS `table_a` (
`fk1` int(11) DEFAULT NULL,
`avg_100` int(11) DEFAULT NULL,
`avg_score` int(11) DEFAULT NULL,
`cvg_date` datetime DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE IF NOT EXISTS `table_b` (
`fk1` int(11) NOT NULL DEFAULT '0',
`avg_100` int(11) DEFAULT NULL,
`avg_score` int(11) DEFAULT NULL,
`cvg_date` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
,當我嘗試執行查詢
UPDATE table_a a LEFT JOIN ((
SELECT fk1, SUM(avg_100) as avg_100, SUM(avg_score) as avg_score, MAX(cvg_date) as cvg_date
FROM table_b
GROUP BY fk1
) AS b1) AS b ON a.fk1= b.fk1
SET
a.avg_score = b.avg_score,
a.avg_100 = b.avg_100,
a.cvg_date = b.cvg_date
我得到一個錯誤:
[Err] 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'b ON a.fk1= b.fk1
SET
a.avg_score = b.avg_score,
a.avg_100 = b.avg_100,
' at line 4
謝謝@Eddie你是對的。 – 2013-03-27 04:59:51