Ranking counts from multiple columns

Database Management

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April 8th, 2003, 07:33 AM

katej

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Ranking counts from multiple columns

I have a table where every record is a questionnaire with three questions. Each question has a yes/no answer:

(can't get this to line up...)

QID A B C
1 y n n
2 y y y
3 n n n
4 y n y

I need to count the 'yes' answers for each question and then rank them descendingly. Ie. I want a table looking like this:

Question Count
A 3
C 2
B 1

I have tried individual queries to count each (SELECT Count(a) FROM table WHERE a; ), which gives me the values I need, but I cannot find a way to rank them in a single query.

Suggestions?

Kate.

Last edited by katej : April 8th, 2003 at 07:35 AM.

April 8th, 2003, 08:47 AM

swampBoogie

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Code:

select * from (
select 'A' as question,count(*) as total
from t 
where QID = 'A' 
and A = 'y'
union all
select 'B',count(*) from t 
where QID = 'B' 
and B = 'y'
union all
select 'C',count(*) from t 
where QID = 'C' 
and C = 'y'
) dt
order by total desc

April 8th, 2003, 10:20 AM

katej

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With some slight tweaking it works beautifully - thanks a lot!

Kate.

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