SQL在预订系统中连续两天查找

Question

扩展这个问题： hotel reservation system SQL query: identify when one specific room is available

使用上面问题中列出的架构，我怎样才能有一个查询“在本周连续2天找到我的房间？”

Answer 1

只需加入可用性表两次

SELECT rooms.* FROM rooms, availability as a1, availability as a2
WHERE rooms.id = 123
AND a1.room_id = rooms.id
AND a2.room_id=  rooms.id
AND a1.date_occupied + 1 = a2.date_occupied

或者，如果我们不像1985年那样编写SQL：

SELECT rooms.* FROM rooms
JOIN availability a1 on a1.room_id = rooms.id
Join availability a2 on a2.room_id = rooms.id AND a1.date_occupied + 1 = a2.date_occupied
WHERE rooms.id = 123