Removing duplicate rows from a table

Removing duplicate rows from a table has several ways. I prefer below method, because it is easy to implement. For table, schema1.table1 having columns col1, col2, col3 which will be primary key or unique key columns after removing duplicate entries will be accomplished by below SQL:
DELETE FROM schema1.table1 a
WHERE a.ROWID >
ANY (SELECT b.ROWID
FROM schema1.table1 b
WHERE a.col1 = b.col1
AND a.col2 = b.col2
AND a.col3 = b.col3);