Question

尝试使用子查询删除行时出错：

DELETE FROM tblOrderDetails
WHERE  ProductID = (SELECT ProductID FROM tblProducts WHERE Discontinued = 1)

我理解的错误是：

Msg 512，Level 16，State 1，Line 1
  子查询返回的值超过1。当子查询遵循=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或子查询用作表达式时，不允许这样做。
  声明已经终止。

我知道子查询返回了几个值，但是如何删除这些行谢谢任何帮助将不胜感激。帕特里克

Answer 1

试试这个

DELETE FROM tblOrderDetails 
WHERE ProductID IN (
    SELECT ProductID 
    FROM tblProducts 
    WHERE Discontinued = 1
)

Answer 2

使用in：

DELETE FROM tblOrderDetails WHERE ProductID IN (SELECT ProductID FROM tblProducts WHERE Discontinued = 1)

Answer 3

试试这个：

 DELETE OD
 FROM tblOrderDetails AS OD
 INNER JOIN tblProducts as P ON P.ProductID =OD.ProductID 
 WHERE P.Discontinued = 1;

Answer 4

IN将允许您定义应删除的集合而不是单行。

DELETE FROM tblOrderDetails WHERE ProductID IN (SELECT ProductID FROM tblProducts WHERE Discontinued = 1)

Answer 5

DELETE 
  FROM tblOrderDetails
 WHERE EXISTS (
               SELECT * 
                 FROM tblProducts AS T2
                WHERE T2.ProductID = tblOrderDetails.ProductID
                      AND T2.Discontinued = 1
              );

但审计师对现已停产的产品的历史数据丢失有何看法......？

SQL Server DELETE错误 - 子查询返回的值超过1

5 个答案: