Re: Inheritance

When will the function inheritence be futher development? That Primary keys
work wil on both parent and child table.

Now a use one table and several table with the same foreign keys to that
table. And a function have to do two insert of update actions.

----- Original Message -----
From: "Tom Lane" <tgl@sss.pgh.pa.us>
To: "Hasnul Fadhly bin Hasan" <hasnulfadhly.h@mimos.my>
Cc: <pgsql-novice@postgresql.org>
Sent: Tuesday, December 21, 2004 4:45
Subject: Re: [NOVICE] Inheritance


> 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
>
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