what about using 'distinct' in you select statement?
----- Original Message -----
From: "Haller Christoph" <ch@rodos.fzk.de>
To: "Patrik Kudo" <kudo@partitur.se>
Cc: <pgsql-sql@postgresql.org>
Sent: Thursday, September 20, 2001 11:02 AM
Subject: Re: [SQL] Selecting latest value II
> What do you mean by
> "the latest val for each userid"
> I cannot understand how a value of type integer
> can have a attribute like "latest".
> Sorry, but I need at least a bit more information.
> Regards, Christoph
> >
> > On Thu, 20 Sep 2001, Haller Christoph wrote:
> >
> > > Try
> > > create NEWtable (userid text, val integer, ts timestamp);
> > > insert into NEWtable
> > > select userid, val, max(ts) from table group by userid, val;
> >
> > That won't work. That will give me multiple userid-val combinations.
Sure,
> > the userid-val combinations will be unique, but I want unique userids
> > with only the latest val for each userid.
> >
> > /Patrik Kudo
> >
> > > >
> > > > Hi,
> > > >
> > > > I have a table which basically looks like this:
> > > >
> > > > create table (userid text, val integer, ts timestamp);
> > > >
> > > > This table holds multiple values for users, timestamped for history
> > > > reasons.
> > > >
> > > > Now I need to fetch the latest val for each userid to insert into a
new
> > > > table (with about the same schema, except for uniqueness on userid).
> > > > I belive this should be a trivial task, but I'm experience total
lack of
> > > > insight here...
> > > >
> > > > Comments?
> > > >
> > > > /Patrik Kudo
> > > >
> > >
> >
> >
>
>
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