Question

I have a table, which is fill of duplicate rows. I need to refresh the table by removing all the duplicate rows. I can do it with writing procedure. it there any fastest way for this?

Answer 1

DELETE MyTable 
FROM MyTable
LEFT OUTER JOIN (
   SELECT MIN(RowId) as RowId, Col1, Col2, Col3 
   FROM MyTable 
   GROUP BY Col1, Col2, Col3
) as KeepRows ON
   MyTable.RowId = KeepRows.RowId
WHERE
   KeepRows.RowId IS NULL