select a.line_id as 'LINE',
a.seat_no as 'SEAT_F',
c.seat_no as 'SEAT_T'
from SEAT_RESERVE as a
inner join SEAT_RESERVE as b
on a.line_id=b.line_id and
a.seat_no+1=b.seat_no
inner join SEAT_RESERVE as c
on a.line_id=c.line_id and
a.seat_no+2=c.seat_no
where a.rsv_status+
b.rsv_status+c.rsv_status=0
and a.seat_no <= 13
order by 1 desc,2 asc