SELECT
    PT.PF_CODE AS 都道府県コード
    ,PF.PF_NAME AS 都道府県名
    ,PT.TOTAL_AMT AS 総人口2015年
    ,PT2020.TOTAL_AMT AS 総人口2020年
    ,ROUND(
        CAST(PT2020.TOTAL_AMT AS REAL) 
        / CAST(PT.TOTAL_AMT AS REAL) * 100)
    AS 人口増加率
FROM
    POPU_TRANSITION AS PT
    INNER JOIN PREFECTURE AS PF 
        ON PF.PF_CODE = PT.PF_CODE
    INNER JOIN POPU_TRANSITION AS PT2020
        ON PT2020.PF_CODE = PT.PF_CODE
        AND PT2020.SURVEY_YEAR = 2020
WHERE
    PT.SURVEY_YEAR = 2015
    -- AND PO2020.TOTAL_AMT >= PO.TOTAL_AMT
ORDER BY 
    人口増加率 DESC,
    都道府県コード ASC;