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unique()ness not always maintained

From: Frank Cusack <fcusack(at)iconnet(dot)net>
To: pgsql-bugs(at)postgresql(dot)org
Subject: unique()ness not always maintained
Date: 1999-11-11 09:00:21
Message-ID: 199911110900.BAA06362@yem.jsv.qwest.net (view raw or flat)
Thread:
Lists: pgsql-bugs
Solaris 2.6/sparc; postgres 6.5.1

dns=> create table test (zone int4, net cidr, unique(zone, net));
NOTICE:  CREATE TABLE/UNIQUE will create implicit index 'test_zone_key' for table 'test'
CREATE
dns=> insert into test (zone, net) values (1, '1.2.3/24');
INSERT 21750 1
dns=> insert into test (zone, net) values (1, '2.3.4/24');
INSERT 21751 1
dns=> insert into test (zone, net) values (1, '1.2.3/24');
INSERT 21752 1
dns=> insert into test (zone, net) values (1, '2.3.4/24');
ERROR:  Cannot insert a duplicate key into a unique index
dns=> select * from test;
zone|net     
----+--------
   1|1.2.3/24
   1|2.3.4/24
   1|1.2.3/24
(3 rows)


Once a unique error is reported, uniqueness seems to be maintained.
Also, if you enter 4 values, then try a duplicate, it all works.

The threshold seems to be 3.

~f

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