[英]How to count number of nights booked per month with check-in and check-out dates having different months in SQL?
[英]Give a list of booked rooms for months of May, Jun And July 2009, having price greater than 8000 per day
桌子
Hotel (hotelNo, HotelName, city)
Room (roomNo, hotelNo, type, price)
Booking (hotelNo, guestNo, dateFrom, dateTo, roomNo)
Guest (guestNo, guestName, guestAddress)
根据上表,为以下查询提供结构化查询语言语法:
列出2009年5月,6月和7月几个月价格超过8000美元的预订房间。
我尝试了以下操作,但不起作用:
SELECT *
FROM Booking
WHERE HotleNo IN (SELECT HotelNo FROM Room WHERE Price>8000)
AND (DateFrom>= '2009-05-01' AND dateTo<= '2009-07-31');
价格是“房间”属性而不是“酒店”属性。 但我想您可能正在处理几间客房号重叠的酒店,因此您必须将roomNo和hotelNo匹配
SELECT *
FROM Booking
JOIN Room on Booking.roomNo=Room.roomNo and Booking.hotleNo=Room.hotleNo
WHERE Room.Price>8000
AND Booking.DateFrom>= '2009-05-01'
AND Booking.dateTo<= '2009-07-31'
编辑:在您的问题字段是hotleNo,所以我会坚持该字段名称
您可以尝试以下方法。 由于您需要的所有信息都可以从Booking和Room表中检索到,因此您只需将2加入并获取数据。
select B.* from Booking B
left outer join Room R
on R.roomNo = B.roomNo
where B.dateFrom >= '2009-05-01'
and B.dateTo <= '2009-07-31'
and R.price > 8000
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