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Selecting one or all records in a stored procedure

Posted on 2013-01-08
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Last Modified: 2013-01-23
I am trying to do a stored procedure where when a you have a value then it returns one record but if no value is inserted into the stored procedure, it returns all records.  So here is my stored procedure:

ALTER PROCEDURE
[dbo].[SP_SelectAllContinentsLoc]
@continentName      nvarchar(50)
AS
SELECT continentId, continentName
FROM
dbo.tblcontinents
WHERE
continentName = @continentName


So how would I set it that if @continentName is null, it returns all records?  Thanks!
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Question by:VBBRett
6 Comments
 
LVL 26

Assisted Solution

by:Chris Luttrell
Chris Luttrell earned 125 total points
ID: 38757845
ALTER PROCEDURE 
[dbo].[SP_SelectAllContinentsLoc]
@continentName      nvarchar(50) = NULL
AS
SELECT continentId, continentName
FROM
dbo.tblcontinents
WHERE
@continentName IS NULL
OR
continentName = @continentName

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Now you can pass in NULL or not supply it at all and it should return all records from tblcontinents
0
 
LVL 2

Assisted Solution

by:harshada_sonawane
harshada_sonawane earned 125 total points
ID: 38757858
u can use if else

ALTER PROCEDURE
[dbo].[SP_SelectAllContinentsLoc]
@continentName      nvarchar(50) = NULL
AS
if @continentName is null
    SELECT continentId, continentName
    FROM
    dbo.tblcontinents
else
     SELECT continentId, continentName
    FROM
    dbo.tblcontinents where continentName = @continentName
0
 
LVL 26

Expert Comment

by:Chris Luttrell
ID: 38757868
I do not really recommend making a practice of using IF/ELSE with 2 selects in a stored procedure as it will cause performance issues with the optimizer and stored execution plans depending on which path is taken the first time the Procedure is called, but that is a much larger discussion.
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LVL 21

Assisted Solution

by:Alpesh Patel
Alpesh Patel earned 125 total points
ID: 38758518
SELECT TOP
            (CASE WHEN (SELECT COUNT(1) FROM
            dbo.tblcontinents where continentName = @continentName)) > 0 THEN  (SELECT COUNT(1) FROM
            dbo.tblcontinents where continentName = @continentName) ELSE (SELECT COUNT(1) FROM
            dbo.tblcontinents) END )
      continentId, continentName
FROM
      dbo.tblcontinents
WHERE
      continentName = @continentName
0
 
LVL 13

Accepted Solution

by:
LIONKING earned 125 total points
ID: 38758740
You can also try something like this:

ALTER PROCEDURE 
[dbo].[SP_SelectAllContinentsLoc]
@continentName      nvarchar(50)
AS
SELECT continentId, continentName
FROM
dbo.tblcontinents
WHERE
ISNULL(@continentName, continentName) = continentName

Open in new window

0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 38761519
I do not really recommend making a practice of using IF/ELSE with 2 selects
Actually I suspect it would actually perform better.  The real problem is that I suspect that this is not just a simple case of 2 SELECTs, but rather could morph into something much more complex.
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