On 2020-10-12 10:40:03 -0400, Tom Lane wrote:
> "Peter J. Holzer" <hjp-pgsql@xxxxxx> writes:
> > In the GROUP BY clause I can use the alias year which was defined
> > earlier in SELECT.
>
> This is a pretty unfortunate legacy thing that we support because
> backwards compatibility (and because "GROUP BY 1" is so frequently
> a handy shortcut).
[...]
> I think SQL versions newer than SQL92 disallow these references entirely.
>
> (I'm being fairly brief here, but this has all been litigated multiple
> times before. See the archives.)
That's ok, you've answered my question. Thanks.
hp
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_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | hjp@xxxxxx | -- Charles Stross, "Creative writing
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