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- select hroom.roomnumber from hroom,hguest,hbooking
- where
- '28.01.2012' not between to_char(arrivaldate, 'dd.mm.yyyy') and to_char(departuredate, 'dd.mm.yyyy') and
- hguest.bookingid = hbooking.bookingid and
- hroom.roomnumber = hguest.roomnumber
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