double case statement

Posted on 2014-04-07
Last Modified: 2014-05-07
I have a case statement I am trying to use to prioritize the ordering.
How can I add 2 clauses to the case?

When I do this is works:
CASE WHEN state = @stateAb THEN 0 ELSE 1 END

when I try to do this, I don't get it returned state = only
CASE WHEN state = @stateAb and usedForCity = 0 THEN 0 ELSE 1 END
Question by:rivkamak

Expert Comment

ID: 39983442
Try nesting the case statements.... what you're trying works in later versions of SQL, not familiar with 2005 enough to say if this was added later. the below should work though.
case when state=@stateAb THEN CASE WHEN usedForCity=0 THEN 0 ELSE 1 END ELSE 1 END

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LVL 65

Expert Comment

by:Jim Horn
ID: 39983476
>when I try to do this, I don't get it returned state = only
Offhand the syntax appears correct, assuming state and @stateAb does not contain a NULL value.  If there are NULLs, then you'll have to use the ISNULL function to handle them.   Can you post your full T-SQL?

In case it helps, an example of nesting CASE statements is in SQL Server CASE Solutions, do a find on 'CASE blocks can also be nested within themselves'.

>use to prioritize the ordering.
Also, the section below that deals with CASE in an ORDER BY clause.

Author Comment

ID: 39983499
select  top 100 percent * into #t1 from k4kReviewsForSite2013 ORDER BY
   -- First sort position
 CASE WHEN state = @stateAb THEN 0 ELSE 1 END
 select row_number() over( order by (select 1)) rn, *  into #t2
from #T1 

--select * from #t1
--select * from #t2

select * from #T2 where rn between @startNum and @endNum --order by idforstate

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when I write to the temporary table  it works the first way.
when when I add the second clause, i lose the correct ordering.
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LVL 65

Expert Comment

by:Jim Horn
ID: 39983515
Define 'the correct ordering'.

Author Comment

ID: 39983531
right ordering is only if state still shows up first.
LVL 32

Expert Comment

ID: 39983641
Perhaps you could post some sample data and your expected results to help clarify your intent for us?
LVL 48

Accepted Solution

PortletPaul earned 500 total points
ID: 39985080
It may depend on nulls in the usedForCity column, try these

-- if usedForCity is null send it downward in ordering
CASE WHEN state = @stateAb and ISNULL(usedForCity,1) = 0 THEN 0 ELSE 1 END


-- if usedForCity is null send it upward in ordering
CASE WHEN state = @stateAb and ISNULL(usedForCity,0) = 0 THEN 0 ELSE 1 END

If state can be null also then more may be required, e.g.

-- if usedForCity is null send it downward in ordering
CASE WHEN ISNULL(state,'') = @stateAb and ISNULL(usedForCity,1) = 0 THEN 0 ELSE 1 END

Sample data and expected results would help us help you

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