From: | Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: row numbering |
Date: | 2005-02-28 16:46:43 |
Message-ID: | 20050228174643.E583@hermes.hilbert.loc |
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Thread: | |
Lists: | pgsql-general |
> > > > is there a way return a column with the row number automatically
> > > > generated according the way the rows were processed by the query.
> > >
> > > No, but you can easily keep a counter in the client.
> >
> > How, then, do I do it if I "need" the "row number" in a view ?
>
> Keep the counter in the client as you process or display the result
> rows.
Well, but I'd like to use those "row numbers" in a comparison
right inside the view definition ...
Eg.:
There are 5 vaccinations in a given vaccination schedule.
Patient had 3 shots.
I want the view to show me that shot 4 and 5 are missing
without having to enter the cardinality of the vaccination in
the original data.
Karsten
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