小编Kev*_*guy的帖子

什么是0和1的字符串的正则表达式,偶数个零和偶数个？

我有类似的东西(1*01*01*)*(0*10*10*)*.

它看起来不错吗？

请用简单的英语解释这个SQL查询回答的问题:

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 = 'Paris Hilton');