php - Need to see if a range of dates overlaps another range of dates in sql -

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i have table stores bookings of rooms, schema is:

id | room_id | check_in_date | check_out_date | user_id

i need run search query rooms available/unavailable between set range of dates.

also keep in mind there exists table holds dates when room prebooked , in format:

room_id | date

so need run query looks rooms available within set range, how formulate query? i'm using mysql here.

---edit---

theres rooms table of schema:

id | room details etc

the unavailability/prebooked dates table holds sporadic single dates, each date in unavailability table refers date when room reason cannot booked eg: maintenance etc

select    room_id    rooms r    left join bookings b on (       r.room_id = b.room_id       , b.check_in_date > '$max_date'       , b.check_out_date < '$min_date'    )

i'm not sure how pre-booked rooms factors in there no date range. pre-booked rooms entry on bookings or not?


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