From: Richard Huxton <dev@archonet.com>
To: xchris <lyralyra@fastmail.fm>
Cc: pgsql-sql@postgresql.org
Subject: Re: Noob question about types and lists
Date: Thu, 06 Oct 2005 12:20:46 +0100
Message-ID: <4345088E.4090001@archonet.com> (raw)
In-Reply-To: <1128595206.27646.18.camel@lyra>
References: <1128595206.27646.18.camel@lyra>
xchris wrote:
> CREATE TYPE address AS
> (
> street VARCHAR(160),
> city INTEGER,
> cap INTEGER,
> country INTEGER (those are referring to other table)
> );
>
> and then composing table client
>
> CREATE TABLE client
> (
> id SERIAL PRIMARY KEY,
> name VARCHAR(80),
> surname VARCHAR(80),
> address address[3]
> ....
> UNIQUE (name,surname)
> );
>
>
> This doesn't work.
> I cannot create a list of types.
>
> I'm using a wrong syntax? or simply i cannot do this?
From the manuals...
8.10. Arrays
PostgreSQL allows columns of a table to be defined as variable-length
multidimensional arrays. Arrays of any built-in or user-defined base
type can be created. (Arrays of composite types or domains are not yet
supported, however.)
So - you can't do this at the moment.
However - I don't think you want to anyway. If you're going to use a
relational database, try a relational approach! Typically, you would do
something like:
CREATE TABLE client (id ..., name ...)
CREATE TABLE address (id ..., street ...)
CREATE TABLE client_address (client_id ..., address_id ...)
Then, you can add some foreign-key constraints so PG makes sure that the
ID numbers in client_address are all valid.
This makes it simple to get client names, client addresses or both together.
HTH
--
Richard Huxton
Archonet Ltd
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To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, lyralyra@fastmail.fm
Subject: Re: Noob question about types and lists
In-Reply-To: <4345088E.4090001@archonet.com>
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