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Dan wrote on 31/07/2007 10:42:49:

Have a policy detail file keyed by customer#, renewal#, sequence#. I
need
to select all customers, but only the last one in key sequence for each
unique customer. Renewal# and sequence# are 2-digit numerics. Am I
looking
to use DISTINCT with a subselect? My attempts so far have netted only
syntax errors.

Customer# Renewal# Sequence#
3441978 3
3441978 4
3441978 4 1 <== select this one
3452173 3
3452173 3 1
3452173 3 2 <== select this one
3470317 3
3470317 3 1 <== select this one

This is what I came up with (which I think is pretty much what Eric
suggested).

with maxRen as (select custnum, max(renewal) maxRen
from aglib.testDan
group by custnum)

select a.custnum, a.renewal, max(seq)
from aglib.testDan a
inner join maxRen
on a.custnum=maxRen.custnum and a.renewal=maxRen.maxRen
group by a.custnum, a.renewal


If the only record for customer 3480317 was this:

Customer# Renewal# Sequence#
3480317 3

Should it be selected? If not you'd need to add a 'where seq > 0' in
there.

HTH,
Adam

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