How to compare data between two databases in PostgreSQL?

Question

Is it possible to compare two databases with identical structure? Let say that I have two databases DB1 and DB2 and I want to check if there is a difference in data between

Answer 1

The best tool which I ever seen https://pythonhosted.org/Pyrseas/

1. Get dump from database A dbtoyaml ...

2. Generate migration from A => B yamltodb ... [file generated in step 1]