| From: | Oliver Siegmar <oliver(at)siegmar(dot)net> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Improving GROUP BY? |
| Date: | 2005-09-30 13:38:20 |
| Message-ID: | 200509301538.20376.oliver@siegmar.net |
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| Lists: | pgsql-general |
On Friday 30 September 2005 15:23, Peter Eisentraut wrote:
> Am Freitag, 30. September 2005 09:03 schrieb Oliver Siegmar:
> > - Would it be possible to add a feature to PostgreSQL to allow grouping
> > by unique identifiers only?
> > - Is this requirement (all fields in GROUP BY) based on the SQL standard?
>
> What you describe is called "functional dependencies" in the SQL standard.
> (The query processor would recognize that the non-primary key columns
> "functionally depend" on the primary key and therefore do not have to be
> grouped separately.) This is definitely a valid feature but PostgreSQL
> does not implement it yet.
Could you add it to the TODO list? ;-)
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