Even though many of the list members of pgsql-general@postgresql.org suggest that the following is an expected behaviour, my experience in other databases doesn’t permit me accept it as such. I am putting this for the kind consideration of this list
Description : I have two tables with the same data , While I issue an update command to increment the value of a unique field by 1, the statement fails in one table and will succeed in the other table. Following is the script to reproduce the behaviour.
CREATE TABLE master1 ( m1 INT primary key , m2 INT unique ) ;
INSERT INTO master1 VALUES ( 1, 1 ) ;
INSERT INTO master1 VALUES ( 2, 2) ;
UPDATE master1 SET m2 = m2 + 1;
ERROR: duplicate key violates unique constraint "master1_m2_key"
SQL state: 23505
CREATE TABLE master2 ( m1 INT primary key , m2 INT unique ) ;
INSERT INTO master2 VALUES ( 2, 2 ) ;
INSERT INTO master2 VALUES ( 1, 1) ;
UPDATE master2 SET m2 = m2 + 1;
Am I right in requesting to this forum to make this update a success in either case.
Anoo S
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