Find date gaps with mysql

Question

I would like to extract records with having an empty bookingId and get the maximum unbooked days back (from the first free day). The expected result should be:

Answer 1

Pls try this...

select
  concat_ws(',',(concat("ID=",id)),
  min(startDate),
 (concat((count(*) - (endDate is null))," Days Free"))) as result
from (
  select
    pb1.id,
    pb1.bookingDate startDate,
    min(pb2.bookingDate) endDate
  from
    pricesBookings pb1 left join pricesBookings pb2
    on pb1.id=pb2.id
       and pb2.price>0
       and pb2.bookingDate>pb1.bookingDate
  where
    pb1.price=0
  group by
    pb1.id,
    pb1.bookingDate
) s
group by id, endDate
  order by id, startDateselect
  concat_ws(',',(concat("ID=",id)),
  min(startDate),
 (concat((count(*) - (endDate is null))," Days Free"))) as result
from (
  select
    pb1.id,
    pb1.bookingDate startDate,
    min(pb2.bookingDate) endDate
  from
    pricesBookings pb1 left join pricesBookings pb2
    on pb1.id=pb2.id
       and pb2.price>0
       and pb2.bookingDate>pb1.bookingDate
  where
    pb1.price=0
  group by
    pb1.id,
    pb1.bookingDate
) s
group by id, endDate
  order by id, startDate