SELECT
  sandm.PF_CODE "CODE"
 ,n.PF_NAME "NAME"
 ,ROUND((sandm.mainiti*1.0) / (sandm.sousu+1.0)*100.0,1) "PERCENTAGE"
FROM
(
SELECT
  s.PF_CODE
 ,s.sousu
 ,m.mainiti
FROM
(
SELECT
  PF_CODE
 ,SUM(AMT) "sousu"
FROM DRINK_HABITS
WHERE CATEGORY_CODE = '110'
AND GENDER_CODE IN ('2','3')
GROUP BY CATEGORY_CODE,PF_CODE
) s
 LEFT OUTER JOIN
(
SELECT
  PF_CODE
 ,SUM(AMT) "mainiti"
FROM DRINK_HABITS
WHERE CATEGORY_CODE = '120'
AND GENDER_CODE IN ('2','3')
GROUP BY PF_CODE
) m
ON s.PF_CODE = m.PF_CODE
)sandm
LEFT OUTER JOIN PREFECTURE n
ON sandm.PF_CODE = n.PF_CODE
ORDER BY PERCENTAGE DESC ,CODE DESC
;