tsql - 关键字 'IF'附近的语法不正确，如果在WITH之后

Question

我正在尝试在IF之后制作一个WITH，它给我错误Incorrect syntax near the keyword 'IF'
下面是我正在编写的存储过程的示例

CREATE PROCEDURE [dbo].[Proc_MyProc]
@MODE INT = null
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;

WITH ss as (
    select col1, col2, col3, col4, col5
    from TableTest
)

IF @MODE = 1
    select col1 as A, col2, sum(col5) as col5sum
    from ss
    group by col1, col2
    order by col5sum desc
ELSE IF @MODE = 2
    select col1, col2, sum(col5) as col5sum
    from ss
    group by col1, col2, col3
    order by col5sum desc
ELSE IF @MODE = 3
    select col1, col2, sum(col5) as col5sum
    from ss
    group by col1, col2, col4
    order by col5sum desc

END

GO

我试图删除WITH并且语法错误消失了，但是当然这不是解决方案

谢谢 :)

Answer 1

WITH与SELECT一起使用，因此您需要重复WITH或使用临时表。

不过，在这种情况下，WITH实际上没有任何值(value)-让我假设它是简化的。

第一种方法是:

if @MODE = 1
    with ss as (
          select col1, col2, col3, col4, col5
          from TableTest
         )
    select col1 as A, col2, sum(col5) as col3sum
    from #ss
    group by col1, col2
    having SnQuantity > 0
    order by availability desc;
. . . 

第二种方法是:

select col1, col2, col3, col4, col5
into #ss
from TableTest;

if @MODE = 1
    select col1 as A, col2, sum(col5) as col3sum
    from #ss
    group by col1, col2
    having SnQuantity > 0
    order by availability desc;
. . .