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Re: Inheritance

From: "Tjibbe Rijpma" <t(dot)b(dot)rijpma(at)student(dot)tudelft(dot)nl>
To: <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Inheritance
Date: 2004-12-21 08:27:05
Message-ID: 005901c4e736$db6e5db0$1a0313ac@TJIBBE (view raw or flat)
Thread:
Lists: pgsql-novice
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(at)sss(dot)pgh(dot)pa(dot)us>
To: "Hasnul Fadhly bin Hasan" <hasnulfadhly(dot)h(at)mimos(dot)my>
Cc: <pgsql-novice(at)postgresql(dot)org>
Sent: Tuesday, December 21, 2004 4:45
Subject: Re: [NOVICE] Inheritance


> Hasnul Fadhly bin Hasan <hasnulfadhly(dot)h(at)mimos(dot)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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