We just discussed this about a month ago. 3 basic solutions:
1. delete from table where rowid not in (select max(rowid) from table group by col_1,col_2,etc); sql only solution, not really feasible in huge environments 2. Alter table mytab enable constraint PK exceptions into exceptions; Better way; much faster for large tables, lets you audit the duplicate rows by examining exceptions table. 3. Write a cursor; sql coding solution ... probably doesn't give you anything mroe than what option 2 provides. boss > > Hi, > > I am trying to remove the duplicate rows from a table with the column data.. > I cannot use PK as it's just a sequence number... > > I could find all the duplicate rows by grouping the column. but how can i > delete only the duplicate ones and retain the original data.. > > Any help is gr8 ! ! ! > > Warm Regards > Shreekanth > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Rama, Shreekantha (K.) > 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). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Todd Boss 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).
