I use postgres 7.2.1 (debian woody) and PHP.
I've two databases (foo and bar for example) with the same table (ie. stamps).
It's possible with a single query transfer the data from the stamps table in db foo to the stamps table in db bar?
You might want to look in the contrib/ folder of the source distribution (or the equivalent in your packaged installation for "dblink". Haven't used it myself, but it can certainly do what you want here.
-- Richard Huxton Archonet Ltd
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