How to delete duplicates on a MySQL table?

Question

I need to DELETE duplicated rows for specified sid on a MySQL table.

How can I do this with an SQL query?

Answer 1

Here is a simple answer:

delete a from target_table a left JOIN (select max(id_field) as id, field_being_repeated  
    from target_table GROUP BY field_being_repeated) b 
    on a.field_being_repeated = b.field_being_repeated
      and a.id_field = b.id_field
    where b.id_field is null;