SELECT
    *
FROM
(SELECT
    NEW.PF_CODE AS 都道府県コード,
    PF_NAME AS 都道府県名,
    総人口2015年,
    総人口2020年,
ROUND((総人口2020年-総人口2015年)*100.0/総人口2015年,0) AS 人口増加率
FROM
(SELECT
    PF_CODE,
    TOTAL_AMT AS '総人口2020年'
FROM
    POPU_TRANSITION
WHERE
    SURVEY_YEAR = '2020') AS NEW
LEFT OUTER JOIN
(SELECT
    PF_CODE,
    TOTAL_AMT AS '総人口2015年'
FROM
    POPU_TRANSITION
WHERE
    SURVEY_YEAR = '2015') AS OLD
ON 
    NEW.PF_CODE = OLD.PF_CODE
LEFT OUTER JOIN
    PREFECTURE AS PR
ON NEW.PF_CODE = PR.PF_CODE) AS INQUIRED_DATA
WHERE
    人口増加率 > 0
ORDER BY
    人口増加率 DESC,
    都道府県コード ASC