Re: Aggregate question

On Fri, 2004-08-27 at 11:54, Sean Davis wrote:
> I'm sorry for the simple question, but.... I have a table (description
> given below) that I want to do something like:
>
> select oligo,target_id,max(2*matches-mismatch) as "score" from hit
> natural join oligo where oligo like 'H200000%' group by
> oligo,target_id;

...
> But, what I actually want is only those target_ids that reach the max
> score like:

The way to restrict the GROUP BY output is with a HAVING clause. I
think it should go something like this:

select oligo,target_id,max(2*matches-mismatch) as "score" from hit
natural join oligo where oligo like 'H200000%' group by oligo,target_id
HAVING max(2*matches-mismatch) = (SELECT max(2*matches-mismatch) from
hit);

I don't think you can use score as a column name in the having clause,
which is why I have repeated the original definition of that column.

--
Oliver Elphick olly(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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