Re: how to efficiently update tuple in many-to-many relationship?

Drew Wilson <drewmwilson(at)gmail(dot)com> writes:
> I have 2 tables (A,B) joined in a many-to-many relationship via a
> join table ("membership"), where updating table A based on table B
> takes a very long time.
> ...
> -> Function Scan on a (cost=0.00..12.50 rows=1000 width=4)

I think you've left out some relevant details ... there's nothing
in what you said about a set-returning function ...

regards, tom lane