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Need help with CASE statement

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Topic

Niki
Yak Posting Veteran

51 Posts

Posted - 2013-12-20 : 10:56:42

Hi,
I would like to draw an ANSWER from the 4 questions that are posed in a survey.
Here are the rules
- If all Q1,Q2,Q3 & Q4 = ‘Yes’ then ANSWER = ‘Yes’
- If there are only 2 questions answered and 2 left blank, pick the one that is answered other than ‘No’ out of the answered responses
- If there are three responses, then use the answer other than ‘No’ which appears in Q2, then Q3, then Q1.
I need help to build a CASE statement for the above.
Thank you,

Niki

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2013-12-20 : 11:37:56

Can you supply some sample data with expected output in a consumable format? Here are some links to help you provide that:

http://www.sqlservercentral.com/articles/Best+Practices/61537/
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx

PS - We don't do homework, but we can help guide you.

Niki
Yak Posting Veteran

51 Posts

Posted - 2013-12-20 : 15:01:31

Sorry, I was really under pressure to make this update. I accomplished using multiple case statements as below. I am looking for a better way to accomplish the same task.

Update Table1 set

t1.HomLang =
--if the HLS = all English, For EL students, HomLang "Unknown"
case when (lng.FirstlearntLang = '00' and lng.LangSpokenbyAdults = '00' and lng.LangSpokenbychild = '00' ) then 'UU'

--When there are only two languages listed out of Q1,Q2 &Q3, and one is English, use the language other than English

when (lng.FirstlearntLang is null and lng.LangSpokenbyAdults is not null and lng.LangSpokenbychild is not null) and lng.LangSpokenbyAdults = '00' then lng.LangSpokenbychild
when(lng.FirstlearntLang is null and lng.LangSpokenbyAdults is not null and lng.LangSpokenbychild is not null) and lng.LangSpokenbychild = '00' then lng.LangSpokenbyAdults

when (lng.LangSpokenbyAdults is null and lng.FirstlearntLang is not null and lng.LangSpokenbychild is not null) and lng.FirstlearntLang = '00' then lng.LangSpokenbychild
when (lng.LangSpokenbyAdults is null and lng.FirstlearntLang is not null and lng.LangSpokenbychild is not null) and lng.LangSpokenbychild = '00' then lng.FirstlearntLang

when (lng.LangSpokenbychild is null and lng.FirstlearntLang is not null and lng.LangSpokenbyAdults is not null) and lng.FirstlearntLang = '00' then lng.LangSpokenbyAdults
when (lng.LangSpokenbychild is null and lng.FirstlearntLang is not null and lng.LangSpokenbyAdults is not null) and lng.LangSpokenbyAdults = '00' then lng.FirstlearntLang

--If there are three languages listed, then use the language other than English which appears in Q2, then Q3, then Q1
-- possibility of one of them being English

when (lng.FirstlearntLang = '00' and lng.LangSpokenbyAdults != '00' and lng.LangSpokenbychild != '00') then lng.LangSpokenbyAdults
when (lng.LangSpokenbyAdults = '00' and lng.FirstlearntLang != '00' and lng.LangSpokenbychild != '00') then lng.LangSpokenbychild
when (lng.LangSpokenbychild = '00' and lng.FirstlearntLang != '00' and lng.LangSpokenbyAdults != '00') then lng.LangSpokenbyAdults

-- when all three are non-english L2 takes priority over L3 take priority over L1
when ( lng.FirstlearntLang != '00' and lng.LangSpokenbyAdults != '00' and lng.LangSpokenbychild != '00' ) then lng.LangSpokenbyAdults

--If there is only one language listed, and it’s not English, pick this
when ( lng.FirstlearntLang is null and lng.LangSpokenbyAdults is null and lng.LangSpokenbychild != '00' ) then lng.LangSpokenbychild
when ( lng.FirstlearntLang is null and lng.LangSpokenbyAdults != '00' and lng.LangSpokenbychild is null ) then lng.LangSpokenbyAdults
when ( lng.FirstlearntLang != '00' and lng.LangSpokenbyAdults is null and lng.LangSpokenbychild is null ) then lng.FirstlearntLang

--If there is only one non-English, pick this
when ( lng.FirstlearntLang ='00' and lng.LangSpokenbyAdults = '00' and lng.LangSpokenbychild != '00' ) then lng.LangSpokenbychild
when ( lng.FirstlearntLang = '00' and lng.LangSpokenbyAdults != '00' and lng.LangSpokenbychild = '00' ) then lng.LangSpokenbyAdults
when ( lng.FirstlearntLang != '00' and lng.LangSpokenbyAdults = '00' and lng.LangSpokenbychild = '00' ) then lng.FirstlearntLang
end
from Table1 t1
INNER JOIN table2 lng ON t1.table_GU = lng.table_GU
WHERE t1.HomLang = '00'

commit transaction
end try

begin catch
if @@trancount > 0
rollback

DECLARE @ErrMsg nvarchar(4000), @ErrSeverity int
SELECT @ErrMsg = ERROR_MESSAGE(),
@ErrSeverity = ERROR_SEVERITY()

RAISERROR(@ErrMsg, @ErrSeverity, 1)
end catch

Niki

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-12-21 : 01:08:52

Unless you post some sample data and explain what your exact requirement is its difficult to help you out. follow the link posted and give sample data in required format.

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