>> By the way, I presume foreign key indices are used to check for
>> referential integrity on insert. Can the query planner also use then
>> somehow?
>
> It can use them the same way it can use any other index.
Hmm, I guess I thought that "foreign key indices" were some special
kind of index. For instance, I thought that Postgresql might
effectively pre-compute part of the information it needed to do a join
on the two relevant columns.
I'm guessing now that we're just talking about a regular index on a
column that happens to have a foreign key reference to another column.
Is that the case?
Thanks.
- John D. Burger
MITRE
