Question

使用MS SQL server 2008。

我的查询如下：

SELECT * FROM #PreModuleAllData WITH(NOLOCK)
WHERE (@Country   != 'DEFAULT' AND @Country   != '' AND([Language] = @Country ))
OR    (@UserType  != 'DEFAULT' AND @UserType  != '' AND([UserType] = @UserType ))
OR    (@Group     != 'DEFAULT' AND @Group     != '' AND([Company] = @Group ))
OR    (@CodeUsage != 'DEFAULT' AND @CodeUsage != '' AND([User Code]= @CodeUsage ))

如果任何参数设置为''或默认，则计划返回所有数据。如果使用了参数，它应该根据特定的where子句返回。

例如，如果参数@country设置为一种语言，即英语，则查询返回数据。

但如果所有参数都设置为默认值，则不返回任何内容，但我需要返回所有记录，我感觉逻辑缺失的东西非常简单，但我的眼睛看不清楚原因。

任何线索？

Answer 1

试试这个：

SELECT * FROM #PreModuleAllData WITH(NOLOCK)
WHERE (@Country   = 'DEFAULT' OR @Country   = '' OR ([Language] = @Country ))
AND   (@UserType  = 'DEFAULT' OR @UserType  = '' OR ([UserType] = @UserType ))
AND   (@Group     = 'DEFAULT' OR @Group     = '' OR ([Company] = @Group ))
AND    (@CodeUsage = 'DEFAULT' OR @CodeUsage = '' OR ([User Code]= @CodeUsage ))

Answer 2

你的where子句需要一个布尔条件：

WHERE ((@Country = 'DEFAULT') OR @Country!= 'DEFAULT' AND @Country != '' AND([Language] = @Country ))
AND

如果参数国家/地区不是default，则会应用该条件。否则如果参数是默认值，那么将跳过第二个条件。

Answer 3

你必须重写以下逻辑

SELECT * FROM #PreModuleAllData WITH(NOLOCK)
WHERE (@Country   = 'DEFAULT' OR @Country   = '' OR (@Country NOT IN ('DEFAULT','') AND [Language] = @Country ))
OR    (@UserType  = 'DEFAULT' OR @UserType  = '' OR (@UserType NOT IN ('DEFAULT','') AND [UserType] = @UserType ))
OR    (@Group     = 'DEFAULT' OR @Group     = '' OR (@Group NOT IN ('DEFAULT','') AND [Company] = @Group ))
OR    (@CodeUsage = 'DEFAULT' OR @CodeUsage = '' OR (@CodeUsage NOT IN ('DEFAULT','') AND [User Code]= @CodeUsage ))

SQL查询不从where子句返回数据

3 个答案: