SELECT 
    pt.PF_CODE AS 都道府県コード,
    pre.PF_NAME AS 都道府県名,
    pt.TOTAL_AMT AS 総人口2015年,
    pt20.TOTAL_AMT AS 総人口2020年,
    ROUND(CAST(pt20.TOTAL_AMT AS REAL) / CAST(pt.TOTAL_AMT AS REAL) * 100) AS 人口増加率
FROM
    POPU_TRANSITION AS pt
JOIN 
    PREFECTURE AS pre ON pre.PF_CODE = pt.PF_CODE
JOIN 
    POPU_TRANSITION AS pt20 ON pt20.PF_CODE = pt.PF_CODE
WHERE
    pt.SURVEY_YEAR = 2015
    AND pt20.SURVEY_YEAR = 2020
    AND pt20.TOTAL_AMT >= pt.TOTAL_AMT
ORDER BY
    人口増加率 DESC, 都道府県コード;