Question

I am using MSSQL 2005 Server and I have the following SQL query.

IF @CategoryId IN (1,2,3)     BEGIN         INSERT INTO @search_temp_table          SELECT * FROM (SELECT d.DataId, (SELECT [Name] FROM Category WHERE CategoryId = d.CategoryId) AS 'Category', d.Description, d.CompanyName, d.City, d.CategoryId,                 d.CreatedOn, d.Rank, d.voteCount, d.commentCount, d.viewCount         FROM Data d                  INNER JOIN Keyword k                     ON d.DataId = k.DataId         WHERE FREETEXT(k.Keyword, @SearchQ) AND d.CategoryId=@CategoryId AND d.IsSearch=1 AND d.IsApproved=1 ) AS Search_Data     END     ELSE         BEGIN              INSERT INTO @search_temp_table              SELECT * FROM (SELECT d.DataId, (SELECT [Name] FROM Category WHERE CategoryId = d.CategoryId) AS 'Category', d.Description, d.CompanyName, d.City, d.CategoryId,                     d.CreatedOn, d.Rank, d.voteCount, d.commentCount, d.viewCount             FROM Data d                      INNER JOIN Keyword k                         ON d.DataId = k.DataId             WHERE FREETEXT(k.Keyword, @SearchQ) AND d.IsSearch=1 AND d.IsApproved=1 ) AS Search_Data         END 

In the above query I have the category condition,

d.CategoryId=@CategoryId 

which is executed when any category is passed, if no category is passed then I am not considering category condition in where clause, To implement category condition only when if the category in (1,2,3) I have used If-Clause, but can’t we do this in single where query?? that means just check if the values is there in the category (or if it’s easy then we can only check for 1,2,3 values) then that condition will be applied else query will not consider the category condition.

Is there any way, using CASE, or NOT NULL statements ??

Answer 1

Similiar to marks answer you can do the following:

WHERE FREETEXT(k.Keyword, @SearchQ)    AND d.IsSearch=1    AND d.IsApproved=1    AND ((@CategoryId NOT IN (1,2,3)) OR (d.CategoryId = @CategoryId)) ) AS Search_Data 

This way you eliminiate the function call