On 19 July 2010 05:44, Peter <peters@xxxxxxxxxxxx> wrote: > Hi All, > > I have a table which contain's some duplicate rows. I just want to delete > the duplicate records alone > not original records. > > Assume my table as look as below > > column1 column2 > 1 > a > 1 > a > 2 > b > 3 > c > 3 > c > > > > i want the above table need to be as below, After executing the mysql > query. > > column1 > column2 > 1 > a > 2 > b > 3 > c > > > > > Thanks in advance.. > > Regards > Peter > If your table had a db generated sequential unique identifier (an identity / autoinc), then something along these lines may be what you are looking for ... -- Delete everything except the UniqueIDs we want to keep. DELETE FROM Table WHERE UniqueID NOT IN ( -- Just get the UniqueIDs we want to keep. SELECT UniqueID FROM ( -- Get the earlist UniqueID for each Col1, Col2, pairing. SELECT Col1, Col2, MIN(UniqueID) AS UniqueID FROM Table GROUP BY Col1, Col2 ) ) UNTESTED!!!! -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
