WITH Recent_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
),
Checkup_Pairs AS (
    SELECT
        c1.MEMBER_CODE,
        c1.CHECKUP_DATE AS CK_DATE,
        c1.WEIGHT AS CURRENT_WEIGHT,
        c2.WEIGHT AS PREVIOUS_WEIGHT,
        ROUND(c1.WEIGHT - c2.WEIGHT, 1) AS CHG_WT
    FROM
        Recent_Checkups c1
    JOIN
        Recent_Checkups c2
    ON
        c1.MEMBER_CODE = c2.MEMBER_CODE
        AND c1.rn = 1
        AND c2.rn = 2
    WHERE
        ABS(c1.WEIGHT - c2.WEIGHT) >= 5
)
SELECT
    c.CK_DATE,
    m.MEMBER_CODE AS CODE,
    m.LAST_NAME || m.FIRST_NAME AS NAME,
    CASE
        WHEN c.CHG_WT = FLOOR(c.CHG_WT) THEN CAST(FLOOR(c.CHG_WT) AS CHAR)
        ELSE CAST(c.CHG_WT AS CHAR)
    END AS CHG_WT
FROM
    Checkup_Pairs c
JOIN
    MEMBER_MST m
ON
    c.MEMBER_CODE = m.MEMBER_CODE
ORDER BY
    c.CHG_WT DESC,
    c.MEMBER_CODE DESC;