Question

我在以下查询中收到错误

INSERT INTO tableName3 (column1, column2)
    SELECT 
        b.column1,
        SUM (a.column2) AS SumColumn2
    FROM 
        tableName1 AS a
    JOIN 
        tableName2 AS b ON a.column1 = b.column2 
    GROUP BY 
        b.column2
ON DUPLICATE KEY UPDATE tableName3
   SET column2 = SUM (a.column2) AS SumColumn2

错误消息是

关键字＆＃39; ON *＆＃39;
附近的语法不正确

和

关键字＆＃39; AS＆＃39;
附近的语法不正确

如何解决？

Answer 1

首先，你的select语句错误。

SELECT 
    b.column1,
    SUM (a.column2) AS SumColumn2
FROM 
    tableName1 AS a
JOIN 
    tableName2 AS b ON a.column1 = b.column2 
GROUP BY 
    b.column2

这应该按b.column1分组，否则你会得到一个例外，因为select子句中的列必须出现在group by子句中或sql-server中的聚合函数中

第二，Sql server中没有ON DUPLICATE KEY指令。快速搜索在mysql中找到了许多参考文献，但mysql 不是 sql-server。

要在Sql server中实现这种行为，您应该使用MERGE语句。

您的代码应如下所示：

MERGE tableName3  AS target
USING (
    SELECT 
    b.column1,
    SUM (a.column2) AS SumColumn2
    FROM 
    tableName1 AS a
    JOIN 
    tableName2 AS b ON a.column1 = b.column2 
    GROUP BY 
    b.column1
) AS source (column1, SumColumn2)
ON (target.column1= source.column1)
WHEN MATCHED THEN 
    UPDATE SET column2= source.SumColumn2
WHEN NOT MATCHED THEN
    INSERT (column1, column2)
    VALUES (source.column1, source.SumColumn2)

用于在重复键上插入更新的SQL查询是错误的

1 个答案: