WITH Latest_Checkups AS (
    SELECT
        MEMBER_CODE,
        CHECKUP_DATE,
        WEIGHT,
        ROW_NUMBER() OVER (PARTITION BY MEMBER_CODE ORDER BY CHECKUP_DATE DESC) AS rn
    FROM
        HEALTH_CHECKUP
),
Recent_Checkups AS (
    SELECT
        c1.MEMBER_CODE,
        c1.CHECKUP_DATE AS CK_DATE,
        c1.WEIGHT AS LATEST_WEIGHT,
        c2.WEIGHT AS PREVIOUS_WEIGHT,
        (c1.WEIGHT - c2.WEIGHT) AS CHG_WT
    FROM
        Latest_Checkups c1
    JOIN
        Latest_Checkups c2 ON c1.MEMBER_CODE = c2.MEMBER_CODE AND c1.rn = 1 AND c2.rn = 2
)
SELECT
    rc.CK_DATE,
    rc.MEMBER_CODE AS CODE,
    m.LAST_NAME || m.FIRST_NAME AS NAME,
    CASE
        WHEN ROUND(rc.CHG_WT, 1) = ROUND(rc.CHG_WT) THEN CAST(ROUND(rc.CHG_WT) AS INTEGER)
        ELSE ROUND(rc.CHG_WT, 1)
    END AS CHG_WT
FROM
    Recent_Checkups rc
JOIN
    MEMBER_MST m ON rc.MEMBER_CODE = m.MEMBER_CODE
WHERE
    ABS(rc.CHG_WT) >= 5
ORDER BY
    rc.CHG_WT DESC,
    rc.MEMBER_CODE DESC;