Double-Booked Listings

SQL practice question · Hard · Joins · Airbnb

Find pairs of CONFIRMED bookings on the same listing whose stays overlap. Nights run from `check_in` up to (not including) `check_out`, so a booking that checks in on the day another checks out does NOT overlap. Cancelled bookings are ignored. Return `listing_id`, `booking_a`, `booking_b` (booking_a < booking_b), `overlap_nights` (number of shared nights, integer). Order by `listing_id`, `booking_a`, `booking_b`.

Table: listing_bookings

Schema of listing_bookings
ColumnType
booking_idINTEGER
listing_idINTEGER
check_inDATE
check_outDATE
statusTEXT
Sample rows of listing_bookings
booking_idlisting_idcheck_incheck_outstatus
11002026-06-012026-06-05confirmed
21002026-06-042026-06-07confirmed
31002026-06-072026-06-09confirmed
41002026-06-022026-06-03cancelled
52002026-06-102026-06-15confirmed
62002026-06-112026-06-13confirmed
73002026-06-012026-06-30confirmed
Expected output on the sample data
listing_idbooking_abooking_boverlap_nights
100121
200562

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‹ Binge Watchers Within 24 Hours · Monthly Occupancy with Stays Split Across Months ›

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