Re: [SQL] compound key - Mailing list pgsql-sql

From Brett W. McCoy
Subject Re: [SQL] compound key
Date
Msg-id Pine.BSI.3.91.990319190204.8303L-100000@access1.lan2wan.com
Whole thread Raw
In response to compound key  (MESZAROS Attila <tilla@chiara.csoma.elte.hu>)
List pgsql-sql
On Fri, 19 Mar 1999, MESZAROS Attila wrote:

> I have seen the following stucture in AdabasD:
> create table AttributeNames (
>    id           integer not null,
>    name         varchar(200),
>    classId      integer not null
> );
> alter table AttributeNames add primary key (id,classId);
>
> I know, I can't create "compound key" using "alter table", but is there
> any way to create one ?

CREATE UNIQUE INDEX AttributeNames_pkey
ON AttributeNames(id, classId);

Or even

create table AttributeNames (
    id           integer not null,
    name         varchar(200),
    classId      integer not null
    PRIMARY KEY(id, classId);
 );

Brett W. McCoy
                                         http://www.lan2wan.com/~bmccoy
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