Re: (When) can a single SQL statement return multiple result sets?

Thomas Kellerer <shammat(at)gmx(dot)net> writes:
> Tom Lane schrieb am 11.04.2024 um 01:02:
>> Jan Behrens <jbe-mlist(at)magnetkern(dot)de> writes:
>>> While writing a PostgreSQL client library for Lua supporting
>>> Pipelining (using PQsendQueryParams), I have been wondering if there
>>> are any single SQL commands that return multiple result sets.

>> Right now, I don't think so.

> Hmm, what about functions returning multiple refcursors?

Sure, but let's distinguish between "here's an ugly workaround"
and "it just works". Aside from being tedious, the refcursor
approach is restrictive: I don't think you can readily make
a refcursor on the result of INSERT/UPDATE/DELETE RETURNING,
nor on utility statements such as EXPLAIN. (There might be
a way around the former restriction with WITH, but I'm
certain that won't work for EXPLAIN.)

regards, tom lane