Question

有没有办法根据Case语句做一个联盟：

Case
    When @var = 1 Then Select * from TableA Union Select * From TableB
    When @Var = 2 Then Select * From TableC Union Select * From TableD
    When @Var = 3 Then Select * From TableA Union Select * From TableE
    ...
End

准确的信息以及从中可以处理的表格我只是好奇这个概念在SQL Server 2012上是否可行。

因此基于该评论，这将是正确的语法：

IF @var = 1
    Select * from TableA Union Select * From TableB
ELSE
IF @Var = 2
    Select * From TableC Union Select * From TableD
Else
IF @Var = 3
    Select * From TableA Union Select * From TableE
Else
...

Answer 1

基于该评论来自@Lamak我能够使用以下方式获得我想要的结果：

IF @var = 1
    Select * from TableA Union Select * From TableB
ELSE
IF @Var = 2
    Select * From TableC Union Select * From TableD
Else
IF @Var = 3
    Select * From TableA Union Select * From TableE
Else
...

联盟基于案例

1 个答案: