Re: delete inside for plpgsql loop on same relation?

Rob Nikander <rob.nikander@gmail.com> writes:
> Are there guarantees about how this plpgsql behaves? It’s deleting from a table while it loops over it. So far it
seemslike the delete is logically after the select, as I hoped, and doesn’t interfere.  

>     for row in select * from some_stuff loop
>         delete from some_stuff where …
>         ...
>     end loop;

Sure.  A query will not see the effects of queries that start after it.
This isn't particularly plpgsql-specific.

Some qualifications are needed if you have triggers or volatile functions
in the first query (those *can* see later effects); but this usage seems
safe enough.

            regards, tom lane