Re: Merge statement

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
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