Question

Using case statement in Stored procedure

Asked by: artic69

I have the following stored procedure that runs 2 sql statements, basically the statement are the same except for an additional "AND" clause when @intReg > 0.

Firstly this does not work, I get a message to say incorrect syntact at ">"

Second, I don't think this is very elegant.  I would like to declare a variable with the SQL statement when intREg > 0 and when intREg is 0.

Finally just run the variable.



CREATE PROCEDURE prc_s_retrieveSOR (@intYr as int, @intStage as int, @intReg as int)
AS
 
select case

CASE @intReg
    WHEN > 0
      SELECT     *, tblSORStatus.strColor AS strCol
      FROM         tblSOR INNER JOIN
             tblSORStatus ON tblSOR.fkCurrStatus = tblSORStatus.pkSORStatusID
      WHERE     (DATEPART(year, tblSOR.dtSOR) = @intYR)        AND (tblSOR.fkCurrStatus = @intStage )
    ELSE
      SELECT     *, tblSORStatus.strColor AS strCol
      FROM         tblSOR INNER JOIN
             tblSORStatus ON tblSOR.fkCurrStatus = tblSORStatus.pkSORStatusID
      WHERE     (DATEPART(year, tblSOR.dtSOR) = @intYR)        AND (tblSOR.fkCurrStatus = @intStage )  AND fkRegionID=@intReg
      
END CASE

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Asked On
2005-11-26 at 03:10:16ID21643555
Tags

case

,

stored

,

procedure

,

using

,

statement

Topic

Databases Miscellaneous

Participating Experts
2
Points
125
Comments
7

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Answers

 

by: Steven_WPosted on 2005-11-26 at 04:09:36ID: 15364284

(I'm assuming SQL Server)

---

You can use "CASE" in an expression.

e.g. "SELECT CASE WHEN a > 1 THEN 'Many' ELSE 'Not many' END

--

However, as a statement you need IF

e.g

IF @intReg > 0
   BEGIN
     SELECT     *, tblSORStatus.strColor AS strCol
     FROM         tblSOR INNER JOIN
             tblSORStatus ON tblSOR.fkCurrStatus = tblSORStatus.pkSORStatusID
     WHERE     (DATEPART(year, tblSOR.dtSOR) = @intYR)       AND (tblSOR.fkCurrStatus = @intStage )
   END
ELSE
   BEGIN
     SELECT     *, tblSORStatus.strColor AS strCol
     FROM         tblSOR INNER JOIN
             tblSORStatus ON tblSOR.fkCurrStatus = tblSORStatus.pkSORStatusID
     WHERE     (DATEPART(year, tblSOR.dtSOR) = @intYR)       AND (tblSOR.fkCurrStatus = @intStage )  AND fkRegionID=@intReg
   END

 

by: artic69Posted on 2005-11-26 at 23:18:46ID: 15367535

Thanks and it works,

But I was looking at something that requires less code.
I want to declare a variable strSql and assgin the following statemtn to it

SELECT     *, tblSORStatus.strColor AS strCol
     FROM         tblSOR INNER JOIN
             tblSORStatus ON tblSOR.fkCurrStatus = tblSORStatus.pkSORStatusID
     WHERE     (DATEPART(year, tblSOR.dtSOR) = @intYR)       AND (tblSOR.fkCurrStatus = @intStage )

If intReg > 0 then

I want to do something like strSql = strSql + " and intReg=" & @intReg

 

by: angelIIIPosted on 2005-11-27 at 01:33:20ID: 15367735

SELECT     *, tblSORStatus.strColor AS strCol
     FROM         tblSOR INNER JOIN
             tblSORStatus ON tblSOR.fkCurrStatus = tblSORStatus.pkSORStatusID
     WHERE     (DATEPART(year, tblSOR.dtSOR) = @intYR)       AND (tblSOR.fkCurrStatus = @intStage )
    AND ( @intreg=0 OR intReg = @intReg )

 

by: angelIIIPosted on 2005-11-27 at 01:33:47ID: 15367736

PS: if, for tuning, you need more code, don't be lazy

 

by: Steven_WPosted on 2005-11-27 at 04:21:35ID: 15367934

You have a choice :-)

Pick from the following (you're unlikely to get them all)

- easy to read code
- short code
- efficient code
- flexible / expandible
- easy to understand

20120131-EE-VQP-002

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