Question

我想知道下面的INSERT ... ON DUPLICATE KEY语句有什么问题。它一直抱怨 错误代码：1054。未知列＆＃39; A.NoTrans＆＃39;在＆＃39;字段列表＆＃39;

INSERT INTO tableA (id, totalTrans)
SELECT A.id, A.NoTrans
FROM (
    SELECT id, NoTrans, LastUpdatedOn 
    FROM tableB
    UNION
    SELECT id, TotalTrans, LastUpdatedOn 
    FROM tableC 
) A
WHERE A.LastUpdatedOn >= '2015-06-26' AND A.LastUpdatedOn <=  '2015-06-27' 
GROUP BY A.id, A.NoTrans
ON DUPLICATE KEY UPDATE totalTrans = A.NoTrans

如果声明没有 ON DUPLICATE KEY UPDATE totalTrans = A.NoTrans

，则没有问题

INSERT INTO tableA (id, totalTrans)
SELECT A.id, A.NoTrans
FROM (
    SELECT id, NoTrans, LastUpdatedOn 
    FROM tableB
    UNION
    SELECT id, TotalTrans, LastUpdatedOn 
    FROM tableC 
) A
WHERE A.LastUpdatedOn >= '2015-06-26' AND A.LastUpdatedOn <=  '2015-06-27' 
GROUP BY A.id, A.NoTrans

我尝试为UNION列添加别名，但问题仍然存在，例如

SELECT A.id, A.NoTrans AS 'NoOfTrans'
......
ON DUPLICATE KEY UPDATE totalTrans = NoOfTrans

Answer 1

A无法识别表格别名on duplicate key update。它是select语句的一部分，但不是insert语句的一部分。而是使用VALUES()函数：

INSERT INTO tableA (id, totalTrans)
SELECT A.id, A.NoTrans
FROM (
    SELECT id, NoTrans, LastUpdatedOn 
    FROM tableB
    UNION
    SELECT id, TotalTrans, LastUpdatedOn 
    FROM tableC 
) A
WHERE A.LastUpdatedOn >= '2015-06-26' AND A.LastUpdatedOn <=  '2015-06-27' 
GROUP BY A.id, A.NoTrans
ON DUPLICATE KEY UPDATE totalTrans = values(totalTrans);

INSERT的任何错误...... ON DUPLICATE KEY声明

1 个答案: