SQL照会

Question

2012-05-1と2012-11-01の間に予約されている客室を予約データベースから選択するにはどうしますか？

Answer 1

SELECT * from room 
WHERE (roomNo, hotelNo) not in 
(select roomNo, hotelNo 
    from booking 
    where datefrom between '2012-05-01' and '2012-11-01' 
    or dateto between '2012-05-01' and '2012-11-01' 
) 

Answer 2

select r.* from rooms r 
left outer join bookings b on b.roomno = r.roomno 
where b.dateto not between '2012-05-01' and '2012-11-01' 
and b.datefrom not between '2012-05-01' and '2012-11-01' 
or b.roomno is null 

SQLFiddle Example

Answer 3

次これは、2つの特定の日付の間に予約されていないすべての客室を含める必要があります試してみてください。

SELECT * FROM Room r 
JOIN Booking b ON b.hotelNo = r.hotelNo AND r.roomNo = b.roomNo 
WHERE NOT ('2012-05-01' BETWEEN (b.dateFrom AND b.dateTo) 
OR '2012-11-01' BETWEEN (b.dateFrom AND b.dateTo))