Question

我有以下现有查询：

SELECT SUM([Sales Amount (Actual)]) * 1.21
  FROM [DATABASE] 
  WHERE [Posting Date] = '2014-06-22' 
  AND [Location Code] = '129'

有时结果是NULL，所以我想编辑查询和结果＆＃39; 0＆＃39; 0如果结果为NULL，则显示正常结果。

我已经发现我应该使用CASE和ISNULL或者是NULL，但是我无法让它工作。

SELECT CASE WHEN SUM([Sales Amount (Actual)]) * 1.21
    IS NULL '0' 
    ELSE SUM([Sales Amount (Actual)]) * 1.21
    END FROM [DATABASE] 
    WHERE [Posting Date] = '2015-07-01' AND [Location Code] = '121'

我收到错误：

＆＃39; 0＆＃39;
附近的语法不正确

有人可以帮助我吗？

谢谢！

Answer 1

SELECT ISNULL(SUM([Sales Amount (Actual)]) * 1.21, 0) Result
  FROM [TABLE] 
  WHERE condition

Answer 2

你的语法错误。我希望您使用COALESCE（ANSI标准）而不是ISNULL：

SELECT COALESCE(SUM([Sales Amount (Actual)]) * 1.21, 0) 
FROM [Table] 
WHERE [Posting Date] = '2015-07-01' AND [Location Code] = '121'

Answer 3

<强>问题：

在条件之后使用THEN：

SELECT CASE WHEN SUM([Sales Amount (Actual)]) * 1.21
IS NULL THEN '0' 
ELSE SUM([Sales Amount (Actual)]) * 1.21
END FROM [DATABASE] 
WHERE [Posting Date] = '2015-07-01' AND [Location Code] = '121'

更好的解决方案：

使用COALESCE：

SELECT COALESCE(SUM([Sales Amount (Actual)]) * 1.21,0)
FROM [DATABASE] 
WHERE [Posting Date] = '2015-07-01' 
  AND [Location Code] = '121'

COALESCE将返回第一个非空的参数

Answer 4

尝试以下

SELECT SUM(ISNULL([Sales Amount (Actual)],0)) * 1.21
  FROM [DATABASE] 
  WHERE [Posting Date] = '2014-06-22' 
  AND [Location Code] = '129'

CASE WHEN NULL查询

4 个答案: