请用通俗易懂的英语解释这个SQL查询回答了什么问题:
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 =
我的代码本身在一个文件中工作,但是每当我试图运行RustlingsQuiz1.rs时,代码的测试部分就会出现错误。
// GOAL OF PROGRAM
// Mary is buying apples. One apple usually costs 2 Rustbucks, but if you buy
// more than 40 at once, each apple only costs 1! Write a function that calculates
// the price of an order of apples given the order amount. No