Include columns not aggregated in a Group By clause

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Ryan
Sent: Tuesday, July 29, 2014 5:55 AM
To: Midrange Systems Technical Discussion
Subject: SQL MAX in Select with Group's always something. I have this:

A.HRPSS#, A.HRRSTS, B.GPKEY FROM hrsaplp a, gecapdp b WHERE A.HRSTNO= b.gpstor and A.HRAPNO = b.gpapnm and a.hrrsts = '9'
and hradte between 20140727 and 20140728 Order By a.hrstno

And I'm finding some dups (first time ever). So I want to get the max value of B.GPKEY. However, when I change it to MAX(B.GPKEY), I get this:

Column HRSTNO or expression in SELECT list not valid.

How can I have the aggregate function MAX with this SELECT?

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