Ho to do a select distinct with many colums

Question

Hi,
How can I do a select distinct from many colums so that I get only one result for each case.
e.g if I want to select from employees table.
Hire_date,salary,job_id,department_id

Answer 1

This could be one of the solutions !
SQL> SELECT * FROM DS;
DEPTNO JOB             ID
    101 MANAGER        500
    101 ANALYST        520
    105 ANALYST        520
    101 MANAGER        501
    102 MANAGER        501
    102 PROGRAMMER     605
    102 PROGRAMMER     501
    103 CLERK          605
8 rows selected.
SQL> select case when row_number() over(partition by deptno order by deptno)>1
  2  then null else deptno end "DEPTNO",
  3  case when row_number() over(partition by job order by job) >1
  4  then null else job    end "JOB",
  5  case when row_number() over(partition by id  order by id )>1
  6  then null else id  end "ID" from ds;
DEPTNO JOB             ID
    101 ANALYST        520
        MANAGER        500
                       501
    102
                       605
        PROGRAMMER
    103 CLERK
    105
8 rows selected.