SELECT 
 P.PF_CODE AS CODE,
 P.PF_NAME AS NAME, 
 D1.SUM / D2.SUM *100 AS PERCENTAGE
FROM
 PREFECTURE AS P
JOIN (
 SELECT
  PF_CODE, SUM (AMT) AS SUM
  FROM DRINK_HABITS
  WHERE CATEGORY_CODE = '120'
  AND GENDER_CODE <> '1'
  GROUP BY PF_CODE
 ) AS D1 
ON
 D1.PF_CODE = P.PF_CODE
JOIN (
 SELECT 
  PF_CODE, SUM (AMT) AS SUM
  FROM DRINK_HABITS
  WHERE GENDER_CODE <> '1'
  GROUP BY PF_CODE
 ) AS D2
ON
 D2.PF_CODE = P.PF_CODE;