Skip site navigation (1) Skip section navigation (2)

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, whole thread or download thread mbox)
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
> ---------------------------(end of broadcast)---------------------------
> TIP 2: you can get off all lists at once with the unregister command
>     (send "unregister YourEmailAddressHere" to majordomo(at)postgresql(dot)org)

In response to


pgsql-novice by date

Next:From: Lloyd DieterDate: 2004-12-21 12:28:25
Subject: How to get day of week?
Previous:From: Marcin GilDate: 2004-12-21 07:36:47
Subject: Re: pg_dumpall with oids/blobs

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group