Can the Query Output Be Sorted by Multiple Columns? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements

You can specifying multiple columns in the ORDER BY clause as shown in the following example statement, which returns employees' salaries sorted by department and salary value:

SQL> SELECT department_id, first_name, last_name, salary 
  FROM employees ORDER BY department_id, salary;
DEPARTMENT_ID FIRST_NAME      LAST_NAME           SALARY
------------- --------------- --------------- ----------
           10 Jennifer        Whalen                4400
           20 Pat             Fay                   6000
           20 Michael         Hartstein            13000
           30 Karen           Colmenares            2500
           30 Guy             Himuro                2600
           30 Sigal           Tobias                2800
           30 Shelli          Baida                 2900
           30 Alexander       Khoo                  3100
           30 Den             Raphaely             11000
           40 Susan           Mavris                6500
           50 TJ              Olson                 2100
......