Modifying a table that other tables refer to for foreigh key - Mailing list pgsql-general

I have a database with multiple referential integrity links.
I want to make important changes to one of the tables, which is referenced
by other tables for foreign keys (like deleting some columns, or changing
data type).
What would be the easiest way to do it (without re-creating all the other
tables that are refering to it)?
Thanks in advance,
Mihai