Using ORDER BY with multiple IF ELSE statements

Please start any new threads on our new site at https://forums.sqlteam.com. We've got lots of great SQL Server experts to answer whatever question you can come up with.

All Forums

General SQL Server Forums

New to SQL Server Programming

Using ORDER BY with multiple IF ELSE statements

Author

Topic

meadow0
Starting Member

6 Posts

Posted - 2013-03-15 : 13:58:23

Hello all,

I've created a (probably over complex) query that will eventually allow a user to select a value from 3 different variables. @Status, @AcctName, @RptName.

Since I'm allowing the end user to multi-select different values from the variables, my query begins to become a bit more complex...

For instance:

declare @status varchar(150)
select @status = 'ERROR,REVIEW,COMPLETE,DELIVERY PREPARED,ALERT'

IF (@status = 'ALL'
AND @AcctName <> 'ALL'
AND @RptName <> 'ALL')
BEGIN
select * from vw_document_main
WHERE ','+REPLACE(@AcctName,'','')+',' LIKE '%,'+acct_name+',%'
AND ','+REPLACE(@RptName,'','')+',' LIKE '%,'+rpt_title+',%'
END
ELSE
BEGIN.......

Since I'd have to allow for customization I have 9 different IF ELSE statements.

What I need help with doing is creating an ORDER BY variable for the entire IF ELSE statement.

I.E - @ColName = 'system_Status' then the entire IF ELSE statement would Order by System Status...

Any idea?

I began writing a query...

ORDER BY
CASE @ColName
WHEN 'system_Status' THEN system_status
WHEN 'document_status_code' THEN document_status_code

However, I'm not sure where this ORDER BY clause would go into my IF ELSE statement... would it need to be after each individual SELECT statement?

Any clarification would help, thanks!!

SQLNOVICE999
Yak Posting Veteran

62 Posts

Posted - 2013-03-15 : 14:03:17

Yes it has to be in each SELECT statment. So put Order by after
AND ','+REPLACE(@RptName,'','')+',' LIKE '%,'+rpt_title+',%'

and similarly in the Select in ELSE....

You can always use PRINT to see the query and then execute that in query analyzer to make sure the dynamic query is correct.

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2013-03-15 : 14:13:39

I'm not sure what your performance is like with your current set of queries or how much of a concern that is. However, you might be able to use a catach-all query (http://sqlinthewild.co.za/index.php/2009/03/19/catch-all-queries/): something like:

select * 
from vw_document_main
WHERE 
	(
		','+REPLACE(@AcctName,'','')+',' LIKE '%,'+acct_name+',%'
		OR @AcctName = 'ALL'
	)
	AND 
	(
		','+REPLACE(@RptName,'','')+',' LIKE '%,'+rpt_title+',%'
		OR @RptName = 'All'
	)

Another option is go to dynamic sql, that should gain you more performance and possibly be easier to read.

Subscribe to SQLTeam.com

SQLTeam.com Articles via RSS

SQLTeam.com Weblog via RSS

- Advertisement -

Resources