sql-server - SQL Server + 条件连接

Question

有没有一种方法可以执行条件连接，如下所示：

   CREATE TABLE #Entity 
   (    
    [AutoID] [int],
    [Code] [nvarchar](50) NOT NULL,
   )

    INSERT #Entity
    EXEC Entity_GetEntitiesByUserId @UserID

    DECLARE @Condition bit = 0

    SELECT * FROM [Stuff] s

       IF @Condition = 1 BEGIN

       INNER JOIN 
       (
        SELECT Code as eCode from
        #Entity
       ) e
        ON E.eCode  = s.EntityCode 

       END

       WHERE DeletedBy IS NULL

谢谢。

Answer 1

这将在逻辑上做你想要的：

SELECT * 
FROM [Stuff] s
WHERE 
 DeletedBy IS NULL 
 and (@Condition = 0 or s.EntityCode in (select E.code from #Entitye))