On Wed, Jul 13, 2022 at 5:08 PM Shay Rojansky <r...@roji.org> wrote: > Greetings. > > I was trying to understand what - if any - are the guarantees with regards > to ordering for combining queries (UNION/UNION ALL/...). From this > message[1], it seems that UNION ALL does preserve the ordering of the > operand queries, whereas UNION does not (presumably neither do INTERSECT, > INTERSECT ALL, EXCEPT and EXCEPT ALL). > > The documentation[2] makes no mention of this, I'd suggest adding a note > clarifying this. > > Since the documentation doesn't make a guarantee there is none. If you want ordered output use ORDER BY.
David J.
