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" <[EMAIL PROTECTED]> 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: GovindanK INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
