Mark Woodward wrote:
> Shouldn't this work?
> select ycis_id, min(tindex), avg(tindex) from y where ycis_id = 15;
> ERROR:  column "y.ycis_id" must appear in the GROUP BY clause or be
> used in an aggregate function

This would require a great deal of special-casing, in particular 
knowledge of the = operator, and then the restriction to a particular 
form of the WHERE clause.  For overall consistency, I don't think this 
should be allowed.

Peter Eisentraut

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