external input for primary key - Mailing list pgsql-general

I would like to use the output of and external application as the
primary key for tables in postgres, Can postgres do this (via a PL) or
do I need to have my application get the input and send it to postgres
with the rest of the data?

Obviously if I can get postgres to do it then editing tables by had is
easier.

Thanks
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  Rob Brown-Bayliss
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