The Toggles Visibility button on the Layers panel is used for ____ layers.
A. changing the transparency of
B. previewing
C. hiding and showing
D. locking and unlocking
Answer: C
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For each of the following queries, state whether the query is valid and for the valid ones should how each of the queries would be mapped onto a query on the underling base tables.
CREATE VIEW HotelBookingCount (hotelNo, bookingCount) AS SELECT h.hotelNo, COUNT(*) FROM Hotel h, Room r, Booking b WHERE h.hotelNo = r.hotelNo AND r.roomNo ? b.roomNo GROUP BY h.hotelNo; (a) SELECT * FROM HotelBookingCount; (b) SELECT hotelNo FROM HotelBookingCount WHERE hotelNo = ‘H001’; (c) SELECT MIN(bookingCount) FROM HotelBookingCount; (d) SELECT COUNT(*) FROM HotelBookingCount; (e) SELECT hotelNo FROM HotelBookingCount WHERE bookingCount > 1000; (f) SELECT hotelNo FROM HotelBookingCount ORDER BY bookingCount;
__________ means place an element on top of a stack.
A. Push B. Pop C. Peek D. Top
Suppose you plan a user manual that will be available on the Web, but users have said that they will want to be able to print it out as well. What colors should you avoid? Why?
What will be an ideal response?
A(n) _________ is generated by a failure such as power failure or memory parity error.
A. I/O interrupt B. hardware failure interrupt C. timer interrupt D. program interrupt