Question

我想返回不在FocusRegion Canada中的值，但我仍然希望看到来自其他FocusRegion的所有值。（但如果你在澳大利亚，那么你需要有一个FirstPurchaseDate＆lt; = 2001-11-19 21：39：12.000）

这是我的代码，无法让它工作。

SELECT FocusRegion, FirstPurchasedDate 
FROM TabelName
WHERE FocusRegion NOT IN ('Canada') 
AND (FocusRegion NOT IN ('Australia') AND FirstPurchasedDate <= '2001-11-19 21:39:12.000')

Answer 1

您似乎需要使用OR代替AND，因为当您使用AND时，您说它应该不是来自澳大利亚并且日期＆lt; = 2001- 11-19 ，对你有什么不对，你应该在下面使用它：

SELECT FocusRegion, FirstPurchasedDate 
FROM TabelName
WHERE FocusRegion NOT IN ('Canada') 
AND (FocusRegion NOT IN ('Australia') OR FirstPurchasedDate <= '2001-11-19 21:39:12.000')

Answer 2

您为什么使用X IN (Y)？只需使用X != Y即可。这是您的疑问：

SELECT FocusRegion, FirstPurchasedDate 
FROM TabelName
WHERE FocusRegion != 'Canada'
AND (FocusRegion != 'Australia' 
  OR FirstPurchasedDate <= '2001-11-19 21:39:12.000')

Answer 3

绝对值得使用NOT运算符。

你不想要任何在澳大利亚和> '2001-11-19 21:39:12.000'

的地方

SELECT FocusRegion, FirstPurchasedDate 
FROM TableName
WHERE FocusRegion <> 'Canada'
  AND NOT (FocusRegion = 'Australia' AND FirstPurchasedDate > '2001-11-19 21:39:12.000');

Answer 4

我认为这更易于阅读 - 并且更贴切地反映了您在问题描述中详述的逻辑：

SELECT FocusRegion, FirstPurchasedDate 
FROM   TabelName
WHERE 
       FocusRegion <> 'Canada' 
       OR 
          (
            FocusRegion = 'Australia' AND 
            FirstPurchasedDate <= '2001-11-19 21:39:12.000'
          );

SQL - 包含多个AND和NOT IN的WHERE子句

4 个答案: