CASE in a clause ORDER BY

We can use 1,2,3.. to determine the type of order:

SELECT * FROM DEPT
ORDER BY
CASE DEPARTMENT
      WHEN 'MARKETING' THEN  1
      WHEN 'SALES' THEN 2
      WHEN 'RESEARCH' THEN 3
      WHEN 'INNOVATION' THEN 4
      ELSE        5
      END,
      CITY

ID| REGION | CITY | DEPARTMENT | EMPLOYEES_NUMBER |
—— | —— |—— |—— |—— |
12| New England| Boston| MARKETING| 9|
15| West| San Francisco| MARKETING| 12|
9| Midwest| Chicago| SALES| 8|
14| Mid-Atlantic| New York| SALES| 12|
5| West| Los Angeles| RESEARCH| 11|
10| Mid-Atlantic| Philadelphia| RESEARCH| 13|
4| Midwest| Chicago| INNOVATION| 11|
2| Midwest| Detroit| HUMAN RESOURCES| 9|