how to delete duplicate rows from a table in mysql

Does the trick of wrapping it into a derived table work for this case? (Based on http://www.xaprb.com/blog/2006/06/23/how-to-select-from-an-update-target-in-mysql/)

DELETE FROM employee 
WHERE (empid, empssn) NOT IN (
    SELECT empid, empssn FROM (
        SELECT MIN(empid) AS empid, empssn FROM employee 
        GROUP BY empssn
    ) X
);

Edit Yep it seems to work this end.