SELECT
    PF.PF_CODE AS CODE
    , PF.PF_NAME AS NAME
    , ROUND(
        -- 計算項目がINTEGER型なのでCAST関数でREAL型に変換して計算
        CAST(SUM(DH2.AMT) AS REAL) / CAST(SUM(DH1.AMT) AS REAL) * 100
    , 1) AS PERCENTAGE
FROM
    -- メインのクエリでDRINK_HABITSテーブルから総数を取得
    DRINK_HABITS AS DH1
    INNER JOIN PREFECTURE AS PF
        ON PF.PF_CODE = DH1.PF_CODE
    -- 内部結合で同一のDRINK_HABITSテーブルから毎日飲酒数を取得
    INNER JOIN DRINK_HABITS AS DH2
        ON DH2.PF_CODE = DH1.PF_CODE
        AND DH2.GENDER_CODE = DH1.GENDER_CODE
        AND DH2.CATEGORY_CODE = '120'
WHERE
    DH1.CATEGORY_CODE = '110'
    AND DH1.GENDER_CODE IN ('2', '3')
GROUP BY
    CODE
ORDER BY
    PERCENTAGE DESC
    , CODE DESC
;