SQL sortierung / "eigne Definition"

[omata]

Was spricht gegen einen CASE-Verteiler?

SQL-Code:

SELECT ID, C_NO,
       CASE CABINET_G 
         WHEN 'P'  THEN 1
         WHEN 'VP' THEN 2
         WHEN 'S'  THEN 3
         WHEN 'T'  THEN 4
         WHEN 'CH' THEN 5
       END sort
FROM member
WHERE CABINET_G IS NOT NULL
  AND C_NO = ?C_NO
ORDER BY sort