Sql Server 联合与 If 条件

2021-09-10 00:00:00 sql tsql sql-server-2008 sql-server

我有一个类似的查询:

DECLARE @tmpValue
SET @tmpValue = 0 -- it will be change 

SELECT * FROM Animal WHERE AniActive = 1
UNION 
IF @tmpValue > 0 
SELECT * FROM Animal WHERE.Active = 0

当我这样使用时，由于 if 条件，它会出错.由于我们的结构，我必须使用 UNION.

When I use like this it is giving error because of if condition. I have to use UNION because of our structure.

如何在 if 条件下使用它?

How can I use it with if condition?

谢谢，
约翰

推荐答案

移动条件 @tmpValue >0 到 WHERE 子句像这样:

Move the condition @tmpValue > 0 to the WHERE clause like so:

SELECT * FROM Animal WHERE AniActive = 1 UNION SELECT * FROM Animal WHERE @tmpValue > 0 AND Active = 0

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