Oracle: Updating a table column using ROWNUM in conjunction with ORDER BY clause

Question

I want to populate a table column with a running integer number, so I\'m thinking of using ROWNUM. However, I need to populate it based on the order of other columns, someth

Answer 1

A small correction just add AS RN :

UPDATE table_a
     SET sequence_column = (select rn 
                             from (
                                select rowid, 
                                      row_number() over (order by col1, col2) AS RN
                                from table_a
                            ) x
                            where x.rowid = table_a.rowid)