On Wed, Jan 10, 2024 at 09:06:31AM -0700, David G. Johnston wrote:
> It is mostly documented.
>
> https://www.postgresql.org/docs/current/queries-with.html#
> QUERIES-WITH-MODIFYING
> """
> Only one of the modifications takes place, but it is not easy (and sometimes
> not possible) to reliably predict which one.
> ...
> In particular avoid writing WITH sub-statements that could affect the same rows
> changed by the main statement or a sibling sub-statement. The effects of such a
> statement will not be predictable.
> """
>
> Yes, an error would be nice, but the effort put forth stops at unpredictable,
> and saying just don't do it.
Oh, good to know. :-)
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.