Re: PRIMARY KEY on a *group* of columns imply that each column is NOT - Mailing list pgsql-general

On Wed, Apr 27, 2005 at 10:26:30AM -0400,
 Tom Lane <tgl@sss.pgh.pa.us> wrote
 a message of 9 lines which said:

> If that's what you want, declare it as UNIQUE not PRIMARY KEY.

As shown by Patrick TJ McPhee, it does not work:

tests=>  create table x (
tests(>    name TEXT NOT NULL,
tests(>    address INET,
tests(>    CONSTRAINT na UNIQUE (name, address)
tests(>  );
NOTICE:  CREATE TABLE / UNIQUE will create implicit index "na" for table "x"
CREATE TABLE
tests=> INSERT INTO x (name) values ('foobar');
INSERT 45380 1
tests=> INSERT INTO x (name) values ('foobar');
INSERT 45381 1
tests=> INSERT INTO x (name) values ('foobar');
INSERT 45382 1
tests=> INSERT INTO x (name) values ('foobar');
INSERT 45383 1
tests=> select * from x;
  name  | address
--------+---------
 foobar |
 foobar |
 foobar |
 foobar |
(4 rows)