On 2022-Nov-17, PG Doc comments form wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/15/sql-merge.html
> Description:
>
> From the description it looks like a single WHEN clause is accepted, which
> is definitely not true.
Hmm, the main synopsis has
when_clause [...]
where the [...] is there to indicate that when_clause can appear an
arbitrary number of times.
> Please let us know how many WHEN clauses are accepted for each of WNEM
> MATCHED and WHEN NOT MATCHED.
There's no specific restriction, although I didn't try to find a
limit. I wonder what happens if you have a few hundred thousand ...
Time to experiment, I guess.
--
Álvaro Herrera Breisgau, Deutschland — https://www.EnterpriseDB.com/
"No deja de ser humillante para una persona de ingenio saber
que no hay tonto que no le pueda enseñar algo." (Jean B. Say)