How to create unique constraint on a col which has duplicate values

Question

Hi all,
how can i create a unique constraint on a field which have duplicate vaules with no validate clause.
My table name is "ACCT"
Regards
Message was edited by:
53637

Answer 1

Check out following
SQL>DROP TABLE TEST;
Table dropped.
SQL>CREATE TABLE TEST
  2  (
  3     ID          NUMBER
  4    ,NAME        VARCHAR2(30)
  5    ,CITY        VARCHAR2(30)
  6  );
Table created.
SQL>INSERT INTO TEST VALUES(1,'Rajesh','Gurgaon');
1 row created.
SQL>INSERT INTO TEST VALUES(1,'Rajesh','Gurgaon');
1 row created.
SQL>INSERT INTO TEST VALUES(2,'Dinesh','Delhi');
1 row created.
SQL>INSERT INTO TEST VALUES(1,'Rajan','Pune');
1 row created.
SQL>INSERT INTO TEST VALUES(1,'Rajan','Pune');
1 row created.
SQL>COMMIT;
Commit complete.
SQL>ALTER TABLE test ADD CONSTRAINTS uk_on_test UNIQUE(ID,NAME,CITY) DEFERRABLE NOVALIDATE ;
Table altered.
SQL>ALTER TABLE test
  2  ENABLE NOVALIDATE CONSTRAINT uk_on_test;
Table altered.
SQL>INSERT INTO TEST VALUES(1,'Rajesh','Gurgaon');
INSERT INTO TEST VALUES(1,'Rajesh','Gurgaon')
ERROR at line 1:
ORA-00001: unique constraint (AIP.UK_ON_TEST) violatedRegards
Arun