WITH NumberedSeats AS (
    SELECT
        LINE_ID,
        SEAT_NO,
        RSV_STATUS,
        ROW_NUMBER() OVER (PARTITION BY LINE_ID ORDER BY SEAT_NO) - SEAT_NO AS grp
    FROM
        SEAT_RESERVE
    WHERE
        RSV_STATUS = '0'
),
GroupedSeats AS (
    SELECT
        LINE_ID,
        SEAT_NO,
        grp,
        COUNT(*) OVER (PARTITION BY LINE_ID, grp) AS cnt,
        ROW_NUMBER() OVER (PARTITION BY LINE_ID, grp ORDER BY SEAT_NO) AS rnum
    FROM
        NumberedSeats
)
SELECT
    LINE_ID AS LINE,
    MIN(SEAT_NO) AS SEAT_F,
    MIN(SEAT_NO) + 2 AS SEAT_T
FROM
    GroupedSeats
WHERE
    cnt >= 3
GROUP BY
    LINE_ID, grp
HAVING
    COUNT(*) >= 3
ORDER BY
    LINE_ID DESC,
    SEAT_F ASC;