在多語句TVF中使用多個IF ELSE Sql Server

Question

如何在多語句TVF中使用IF ELSE語句？ My Cide就是這樣的

CREATE FUNCTION Production.ms_tvf_ProductCostDifference 
(
@ID INT , 

) 
    RETURNS @retCostDifference TABLE 
    (
     ProductId INT , 
     CostDifference MONEY 
    ) 
    AS 
    BEGIN 

    With ABC as 
    (Select ------ 
    ) 
    if @ID ='1' 
    //some code using ABC defined 
    ELSe IF @ID=2 
    //Somecode 
    Return; 
    END 

應該怎麼流？

Answer 1

你不能使用IF內WITH

，而不是你需要的東西像這樣

if @ID ='1' 
    With ABC as 
     (Select ------ 
     ) 
     //some code using ABC defined 
    ELSE IF @ID=2 
     With ABC as 
     (Select ------ 
     ) 
     //Somecode 
    Return;