Explain this SQL query in plain English.
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Published on 2010-04-11T04:27:34Z
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2010/04/11
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Please explain, in plain English, what question this SQL query answers:
SELECT SUM(price) FROM Room r, Hotel h
WHERE r.hotelNo = h.hotelNo and hotelName = 'Paris Hilton' and
roomNo NOT IN
(SELECT roomNo FROM Booking b, Hotel h
WHERE (dateFrom <= CURRENT_DATE AND
dateTo >= CURRENT_DATE) AND
b.hotelNo = h.hotelNo AND hotelName = 'Paris Hilton');
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