SELECT
    PF.PF_CODE as 都道府県コード,
    PF.PF_NAME as 都道府県名,
    PO.TOTAL_AMT as 総人口2015年,
    PO2020.TOTAL_AMT as 総人口2020年,
    ROUND(
        CAST(PO2020.TOTAL_AMT as REAL) / CAST(PO.TOTAL_AMT as REAL) * 100
    ) as 人口増加率
FROM
    -- 2015年のデータを取得する
    POPU_TRANSITION as PO
    INNER JOIN
        PREFECTURE as PF
        ON PF.PF_CODE = PO.PF_CODE
        AND PO.SURVEY_YEAR = 2015 
    -- 2020年のデータを取得
    INNER JOIN
        POPU_TRANSITION as PO2020
        ON PO2020.PF_CODE = PO.PF_CODE
        AND PO2020.SURVEY_YEAR = 2020
WHERE
    PO.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;