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SubSection | TradingId  | Year  | Amount
100A           5001       2004  -120
200B           5001       2005  -130
300C           5002       2006  -140
300C           5003       2007  -150

I want to return the MAX Trading Id based on the subsection, I want this:

SubSection | TradingId  | Year  | Amount
100A           5001       2004  -120
200B           5001       2005  -130
300C           5003       2007  -150

I tried selecting MAX with a GROUPBY Subsection, tried HAVING MAX etc but no luck

share|improve this question
What version of Sybase? Not sure when analytics/windowing functions first appeared. – Jack Douglas Jan 6 '12 at 13:21
also, should we assume that SubSection, TracingId is unique? – Jack Douglas Jan 6 '12 at 14:59
SubSection, TracingId are not unique – Al. Jan 6 '12 at 16:55
"are" or "is"? To be clear, I'm asking if SubSection, TracingId is unique - if the combination of the two is unique, not if either is unique on its own (which in any case wouldn't tally with your sample data). – Jack Douglas Jan 6 '12 at 17:17
thanks for the help jack,SubSection, TracingId is not unique – Al. Jan 6 '12 at 17:30
up vote 2 down vote accepted
FROM the_table t1
WHERE t1.trading_id = (SELECT max(t2.trading_id)
                    FROM the_table t2
                    WHERE t2.subsection = t1.subsection)
share|improve this answer
This will return all the subsections of the MAX(trading_id) for the table. Don't think it's the same with what OP asked. – Marian Jan 6 '12 at 12:04
No. It will only get the max(trading_id) for the "current" subsection because of the co-related sub-query – a_horse_with_no_name Jan 6 '12 at 12:18
Ah, sorry, me dumb, you're right. – Marian Jan 6 '12 at 12:30
but it will return multiple rows per subsection if subsection, trading_id is not unique – Jack Douglas Jan 6 '12 at 13:18
@Marian quite true :-) the sample data posted is pretty small though and I'm still left doubting what he really wants - I'll ask in a comment. – Jack Douglas Jan 6 '12 at 14:59

This will return all columns from the table, but for the max trading id of each subsection:

Select t2.*
from (
   Select max(TradingId) as MaxTradingId, SubSection
   from TableT
   group by SubSection
) t1 join TableT t2 on t1.MaxTradingId = t2.TradingId and t1.SubSection = t2.SubSection

Give it a try, please.

share|improve this answer
also assumes subsection, trading_id is unique, right? – Jack Douglas Jan 6 '12 at 13:19

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