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T-SQL using CASE in the WHERE clause

Posted on 2011-02-21
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Last Modified: 2012-05-11
this is a simplified code sample from a stored procedure that incorporates a CASE statement in the WHERE clause.

This is part of a Search function where we can search multiple fields with one statement, based upon the value of @searchField (and where @searchTerm has the value of what needs to be found).

This approach doesn't work, what would be the correct syntax?


DECLARE
      @searchField varchar(50)
      ,@searchTerm varchar(50)

SELECT
      *
FROM
      CompanyOrders
WHERE
      (SELECT CASE
            WHEN @searchField = 'REF' THEN OrderReferenceNumber = @searchTerm
            WHEN @searchField = 'NAM' THEN OriginalCompanyName = @searchTerm
            WHEN @searchField = 'DAT' THEN CompanyFilingDate = @searchTerm    
      END)
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Question by:conrad2010
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3 Comments
 
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Accepted Solution

by:
Patrick Matthews earned 500 total points
ID: 34945826
DECLARE
      @searchField varchar(50)
      ,@searchTerm varchar(50)

SELECT
      *
FROM
      CompanyOrders
WHERE
      (@searchField = 'REF' AND OrderReferenceNumber = @searchTerm) OR
            (@searchField = 'NAM' AND OriginalCompanyName = @searchTerm) OR
            (@searchField = 'DAT' AND CompanyFilingDate = @searchTerm)

0
 
LVL 28

Expert Comment

by:strickdd
ID: 34945850
You can't use a CASE to determine a WHERE clause. You need to do an IF statement to separate the WHERE clauses. You can use a CASE for boolean logic in the WHERE, but it isn't recommeneded (e.g., MyCol = CASE WHEN @Filter=1 THEN @Cust ELSE Cust END).
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LVL 28

Expert Comment

by:strickdd
ID: 34945857
Sorry, didn't refresh before posting.
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