Mirrored tables on PostgreSQL I have some values under "account" and I need to have the same values under "invoice", so, I'm trying to find a way to symlink my tables, so every time one gets updated, the another have the new value too. I'm developing under OpenERP, I can't trow that update directly on code, I need to write the rule using PgAdmin or something like.

I need to junction symlink 2 tables under Postgres.

ACCOUNT                INVOICE  
|ID|payment_type|@@@@@@|ID|account_payment_type|  
|#1|cc          |@@@@@@|#1|cc                  |  
|#2|cash        |@@@@@@|#2|cash                |  
|#3|cash        |@@@@@@|#3|cash                |
From your example it seems like invoice can be replaced with a simple VIEW, which is similar to a "symlink" in nature:

CREATE VIEW invoice AS
SELECT id, account_payment_type FROM account;


All done.
Else you need to be more specific in your question. Start with providing the complete table definition for both tables and add more information what is covered in each ...