存储过程中“案例陈述”中的“或”条件

Question

I wanted to know if it is possible to have a condition like:

((CASE WHEN (a = 1 AND b = 1) OR c = 0 THEN xyz ELSE 0))

I could see lot of CASE with AND but with no OR.

And one more thing is this is need for a SELECT query like

Select x,y,z, SUM(( CASE WHEN .....))

from table.

Any help will be appreciated

CREATE PROCEDURE abc
@sid int
AS
BEGIN
SELECT
  Column1,
  Column2,
  Column3,
  SUM((CASE WHEN ((a = 1 AND b != 0 ) OR (c = 720)) THEN Amount ELSE 0 END)) 
     AS total
FROM view 
WHERE sid = @sid
END

Answer 1

I've not been able to test this, but what you need is the following. There may be a smarter way of writing this.

SELECT
    Column1,
    Column2,
    Column3,
    SUM(NewAmount) AS TOTAL
FROM
SELECT
    Column1,
    Column2,
    Column3,
    CASE 
        WHEN (a = 1 AND b != 0 ) OR c = 720 THEN Amount 
        ELSE 0 
    END
    AS NewAmount
FROM 
    view 
GROUP BY
    Column1,
    Column2,
    Column3

Answer 2

This should work:

Select
    Column1,
    Column2,
    Column3,
    Sum(
        Case
            When ( ( a = 1 ) And ( b != 0 ) ) Or ( c = 720 ) Then Amount 
            Else 0 
        End
    ) As total
From 
    view 
Where
    sid = ...
Group By
    Column1, Column2, Column3

if a, b and c are numbers.

Answer 3

If you want readable solution you could avoid using multiple statement and a lot of round brackets.

CASE WHEN A OR B OR C THEN amount
     ELSE 0
END
<=>
CASE WHEN A THEN amount              -- this condition will be evalued first
     WHEN B THEN amount              -- second
     WHEN C THEN amount              -- and third
     ELSE 0
END

In your case:

CREATE PROCEDURE abc
   @sid int
AS
BEGIN
SELECT
  Column1,
  Column2,
  Column3,
  [total] = SUM(CASE 
                   WHEN c = 720          THEN Amount
                   WHEN a = 1 AND b != 0 THEN Amount 
                   ELSE 0 
                END)  
FROM view 
WHERE sid = @sid
GROUP BY Column1, Column2, Column3
END

Note that you need to use GROUP BY for columns that aren't wrapped with aggregation functions.

---

Second thing I would use user defined table valued function instead of stored procedure:

 CREATE FUNCTION [dbo].[abc](@sid int) RETURNS TABLE AS RETURN ( SELECT Column1, Column2, Column3, [total] = SUM(CASE WHEN c = 720 THEN Amount WHEN a = 1 AND b != 0 THEN Amount ELSE 0 END) FROM view WHERE sid = @sid GROUP BY Column1, Column2, Column3 ); 

Then I could do whatever I want with resultset:

 SELECT * FROM [dbo].[abc](1) WHERE Column1 = 'xxx'