RE: (Non)Unique Index Vs Unique Constraint

Govindan,

You can create FK relationship(Parent-child) by using UNIQUE constraint.. Correct me if I am wrong.

-----Original Message-----
Sent: Thursday, January 22, 2004 6:37 PM To: Multiple recipients of list ORACLE-L; Multiple recipients of list ORACLE-L
Cc: jaysingh1_at_optonline.net

Add this to what Arup said:

PK enables one to have References established in a schema. (Parent Child relationships i mean). That cannot be done just by having a unique and/or
not null constraints set.
You will get ORA-02270: no matching unique or primary key for this column-list

HTH
GovindanK

On Sat, 17 Jan 2004 20:49:25 -0800, "Arup Nanda" <orarup_at_hotmail.com> said:
> Jay,
>
> Remember, both UK and PK are enforced by unique indexes. The important
> difference between them is a null value is allowed in UK, not in PK.
>

--
http://www.fastmail.fm - Access your email from home and the web

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jay
  INET: jaysingh1_at_optonline.net

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).