PostgreSQL has an md5 function, and I'd have a look at pgcrypto (pgcrypto is one of Postgres' contrib modules).

(By the way, don't call it 'Postgre'. That's as forbidden as 'PERL'. The database is called PostgreSQL or postgres. Many people will understand 'Pg'.)

In reply to Re: Hashing temporal tables in PostgreSQL by erix
in thread Hash generate and find tampered tables in PostgreSQL by gtk

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