| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Richard Huxton <dev(at)archonet(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, Lee Keel <lee(dot)keel(at)uai(dot)com>, piotr_sobolewski <piotr_sobolewski(at)o2(dot)pl>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: select random order by random |
| Date: | 2007-11-01 21:11:33 |
| Message-ID: | 15358.1193951493@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> Something twigged telling me that in fact the latter expression is not
> in standard SQL but a (very common) extension. A <sort key> is clearly
> indicated to be a <value expression> with no indication anywhere that
> column aliases are allowed here (though that may be in the common rules
> somewhere).
SQL92 says differently. The committee basically redefined ORDER BY
entirely between SQL92 and SQL99.
What we actually try to support is both SQL92 and SQL99 interpretations,
which is a pretty unholy mess, but enough people (and programs) are used
to the SQL92 way that I don't foresee being able to drop it.
regards, tom lane
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