A simple question (under pressure :-))....

John Wells <jb@sourceillustrated.com> writes:

Guys,

I have approx. 8 hours to finish a deadline, so I can no longer spend time searching google...haven't found the answer yet.

In PG, is there not a way to select amongst databases?

In other words, if I have one schema called sch1 and another called sch2, and I'm connected to sch2, could I not do:

select fieldname from sch1.tablename

I'm running 7.2.3, so I think there was no such things as a schema in this release...just a database, but can't recall.

Right. Schemas went into 7.3. You can try 'contrib/dblink' for
cross-database queries in earlier versions--it might or might not work
for you (I've never used it myself).

It seems I've been able to do this in the past, but I may be
remembering wrong.

Maybe that was with 7.3 or 7.4?

-Doug

Hi John,

Short answer: you can do cross-schema queries, you can't (easily) do
cross database queries.

Check out this:
http://www.postgresql.org/docs/7.4/static/ddl.html
, the schema section:
http://www.postgresql.org/docs/7.4/static/ddl-schemas.html

I'm not sure when schemas were introduced, but I suppose you want to use
the latest postgres version.

Cheers,
Csaba.