Re: Type Inheritance

"If you had said what this *does*, we might be better able to help"

basically i have a series of types (or data types), of which one is the root and each of the other types appear under the root as in generalisation/specialisation style, inheriting the above types attributes etc. this is what im trying to achieve, although at present, to no avail :(

----- Original Message -----
From: "Andrew Thorley" <andrew(dot)thorley(at)linuxmail(dot)org>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: [SQL] Type Inheritance
Date: Sat, 27 Nov 2004 22:04:55 +0800

>
> hi tom thanks for reply.
>
> im trying to provide inheritance for data types (domains), not tables. i will look into the syntax associated with domains as data types does not include an inheritance function (or so i think).
>
> regards andy.
>
>
> ----- Original Message -----
> From: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
> To: "Andrew Thorley" <andrew(dot)thorley(at)linuxmail(dot)org>
> Subject: Re: [SQL] Type Inheritance
> Date: Fri, 26 Nov 2004 13:14:07 -0500
>
> >
> > "Andrew Thorley" <andrew(dot)thorley(at)linuxmail(dot)org> writes:
> > > Does anyone know how to implement type inheritance in postgresql? in oracle you just use the word UNDER in ur code i.e:
> >

> CREATE TYPE test2_UDT UNDER test1_UDT AS (abc INT);
> >
> > If you had said what this *does*, we might be better able to help.
> >
> > But take a look at CREATE DOMAIN, as well as the INHERITS and LIKE
> > options in CREATE TABLE. Some part of that might be close to what
> > you are looking for.
> >
> > regards, tom lane
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 9: the planner will ignore your desire to choose an index scan if your
> > joining column's datatypes do not match
> >
>
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