GenGUID (AutoNumber) in postgres

"Premil Agarwal" <[email protected]>
Newsgroups gmane.comp.db.postgresql.interfaces
Message-ID <[email protected]> 
I have a database that was migrated from Access. I am having trouble porting
"AutoNumber" datatype. The column that is of type "AutoNumber" is suppose to
Unique ID (PK) for that table. Internally it uses GenGUID API in access to
generate the unique ID.

Any ideas on how to port this functionality to Postgres.

Thanks
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