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Re: Inheritance in Postgresql ?

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: ABBAS SHAKEEL <shakeel(dot)abbas(dot)qau(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Inheritance in Postgresql ?
Date: 2009-12-16 06:51:56
Message-ID: dcc563d10912152251y22f53966m5aca84d734697945@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
On Tue, Dec 15, 2009 at 11:36 PM, ABBAS SHAKEEL
<shakeel(dot)abbas(dot)qau(at)gmail(dot)com> wrote:
> Hello
> I am not an expert for database but rarely design database for Web and IVR
> applications.
> Today I wonder if there is any practical advantage of inheritance of Tables.
> Lets take the same example that is commonly referred.
>
> CREATE TABLE cities (
>     name            text,
>     population      float,
>     altitude        int     -- in feet
> );
>
> CREATE TABLE capitals (
>     state           char(2)
> ) INHERITS (cities);
>
> Capital table inherit attributes from Cities but no data. I am confused with
> concept of inheritance in postgres.
>
> In These tables what i was supposing is inheritence as that in JAVA. but its
> seems to be  a different scene.

The child table inherits structure from the parent, the parent then
allows you to retrieve data from it and the children together.

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