[PHP-DB] join across databases - how to select databases?

[Moshe Weitzman]

I have looked all over the web but can't find an example *in php* for 
connecting to a mysql server, selecting database(s), and issueing a query 
which joins across databases. I already know the SQL required to achieve a 
multiple database query. My question is about how many calls to 
mysql_select_db() are required, does order matter, etc.

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