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From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: unique constraint definition within create table
Date: Wed, 2 Dec 2015 07:36:21 +0100
Message-ID: <20151202063621.GA5526@tux> (raw)
List-Unsubscribe: <mailto:majordomo@postgresql.org?body=unsub%20pgsql-sql>

Hi @ll,

i'm trying to create a table with 2 int-columns and a constraint that a
pair of (x,y) cannot be as (y,x) inserted:

test=# create table foo(u1 int,u2 int, unique (least(u1,u2),greatest(u1,u2)));
ERROR:  syntax error at or near "("
LINE 1: create table foo(u1 int,u2 int, unique (least(u1,u2),greates...


I know, i can solve that in this way:

test=*# create table foo(u1 int,u2 int);
CREATE TABLE
test=*# create unique index idx_foo on foo(least(u1,u2),greatest(u1,u2));
CREATE INDEX


But is there a way to define the unique constraint within the create table - command?

Thx.

Andreas
-- 
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect.                              (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly."   (unknown)
Kaufbach, Saxony, Germany, Europe.              N 51.05082°, E 13.56889°


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