Re: Improving GROUP BY?

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? ;-)