Just noticed you replied to me only. Send replies to the list. You can leave individuals cc'd. The convention here is also to inline your replies - top-posting is undesirable.
In any case, in order to write "select *" you have to group on both x and y at the same time. If you group on either column only, the query will fail. So the choice of x versus y is immaterial. Having grouped on x the text is explaining that the failure to also group on y is a problem. I don't know that the existing wording is the most clear, but it is correct. David J. On Wed, Jul 24, 2024 at 8:02 AM Yaroslav Saburov <y.sabu...@gmail.com> wrote: > >>because there is no single value for the column y that could be > associated with each group. > > 24 лип. 2024 р. о 17:51 David G. Johnston <david.g.johns...@gmail.com> > пише: > > > > > On Wed, Jul 24, 2024, 07:45 Yaroslav Saburov <y.sabu...@gmail.com> wrote: > >> group by y, not by x >> >> Why? > > David J. > >>
