"guard":

> if join database1 database2
> 
> how to make

Folks, this really needs to be on a FAQ somewhere:

PostgreSQL does not support inter-database Joins.  Period.

If you want to join tables from two different databases, I suggest that
you use your front-end code to do so.  I would also suggest that you
review your data architecture and see if it's really necessary for you
to store your data in two seperate databases.

-Josh Berkus

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