Hasnul Fadhly bin Hasan <hasnulfadhly.h@mimos.my> writes:
> I'm just wondering, what real benefit does inheritance have? When i
> create two tables, one inherited from the other,
> does that mean i have two tables with same duplicate data or actually
> they are joined in the back end?
It's more like an implicit UNION ALL. There's no duplication, but when
you specify a SELECT/UPDATE/DELETE over the parent table, the child
table is implicitly processed as well.
regards, tom lane