How to delete duplicate values in a column?

consider a table contains 2 columns(NAME & DEPARTMENT)
NAME DEPARTMENT
santhosh finance
santhosh marketing
rahul sales
stephen IT
stephen sales
In the above table how to delete only the duplicate values(santhosh,stephen) in the column?

If you don't care??
delete emp
  where 1 < (select row_number() over(partition by deptno order by 1) from emp)
Error at line 1
ORA-01427: single-row subquery returns more than one rowI'd use something like
delete emp e1
where exists
         (select null
            from (select deptno, rowid rid, row_number () over (partition by deptno order by 1) rn from emp) e2
          where e1.rowid = e2.rid
             and  1 < rn)

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