| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Markus Bertheau <twanger(at)bluetwanger(dot)de>, postgres sql list <pgsql-sql(at)postgresql(dot)org> |
| Subject: | Re: date_part vs extract |
| Date: | 2001-11-29 19:14:25 |
| Message-ID: | 200111291914.fATJEPD24332@candle.pha.pa.us |
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| Lists: | pgsql-sql |
> Markus Bertheau writes:
>
> > I wonder about the difference between date_part('week', ...) and
> > extract(week from ...) not only but also from a performance point of
> > view. I read extract is standard and date_part is not. Backwards
> > compatibility maybe justifies the existence of date_part. Whats else?
>
> I think date_part() was adapted from Ingres. Btw., note that the "week"
> parameter (and most others) aren't standard either.
Yes, from Ingres. I think Thomas added it. Both he and I have Ingres
experience.
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