[英]SQL find two consecutive days in a reservation system
Extending on this question: hotel reservation system SQL query: identify when one specific room is available 扩展此问题: 酒店预订系统SQL查询:确定何时有特定房间可用
Using the schema listed in the question above, how can I have a query that says "Find me a room for 2 consecutive days thats available in this week?" 使用上面的问题中列出的架构,如何获得一个查询,内容为“连续两天为我找一个房间,这周可以住宿?”
Just join to the availability table twice 只需两次连接到可用性表
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
or, if we're not into writing SQL like its 1985: 或者,如果我们不喜欢像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
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