From: | "Stijn Vanroye" <s(dot)vanroye(at)farcourier(dot)com> |
---|---|
To: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | select distinct and order by |
Date: | 2004-04-28 09:27:06 |
Message-ID: | 71E201BE5E881C46811BA160694C5FCB046730@fs1000.farcourier.com |
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Thread: | |
Lists: | pgsql-sql |
Hello everybody,
I have a short question:
I'm trying to run the following query:
select distinct on (staff_id) staff_id, fullname, loginname from staff
where staff_id in
(select staff_id from staffmembership where staffgroup_id=#SomeIdValue#)
order by fullname
I get the follwing error:
select distinct on expressions must match the initial order by expression
Does this mean that I can only order by the same fields as the ones that I use in the distinct?
If so, is there still a way that I can select distinct on the keyfield, and still sort by the name. However unlikely, it could happen that two people have the same name, so a distinct on fullname could make problems.
The facts:
- PostgreSQL 7.3.2 running on RH 9
- pgODBC 7.3.0200
- Borland Delphi 7 enterprise
Regards,
Stijn Vanroye
-=[Today I got more responsabilities from my boss, as from now I'm responsible for everything that goes wrong ...]=-
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