The software interface (such as LPT1) between the computer and the print device is the _________
a. Printer port
b. Print queue
c. Print driver
d. Spooler
A.All answers are part of Windows printer terminology, but only the printer port could relate to LPT1.
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What happens if you have two lists (list1, list2), no assignment operator in your class, and attempt to execute the following statement?
list1 = list2; a. you have a syntax error b. you get a complete and identical copy of list2 into list1 c. list1 and lsit2 now name the same list d. no problem
Which of the following statements is false?
a. In a multithreaded application, threads can be distributed across multiple processors (if available) so that multiple tasks execute in parallel and the application can operate more efficiently. b. The JVM creates threads to run a program and for housekeeping tasks such as garbage collection. c. Multithreading can increase performance only on multi-core systems. d. The vast majority of programmers should use existing collection classes and interfaces from the concurrency APIs that manage synchronization for you.
Again, using the Hotel schema, draw a relational algebra tree for each of the following queries and use the heuristic rules given in Section 23.3.2 to transform the queries into a more efficient form:
(a) SELECT r.roomNo, r.type, r.price FROM Room r, Booking b, Hotel h WHERE r.roomNo = b.roomNo AND b.hotelNo = h.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND r.price > 100; (b) SELECT g.guestNo, g.guestName FROM Room r, Hotel h, Booking b, Guest g WHERE h.hotelNo = b.hotelNo AND g.guestNo = b.guestNo AND h.hotelNo = r.hotelNo AND h.hotelName = ‘Grosvenor Hotel’ AND dateFrom >= ‘1-Jan-04’ AND dateTo <= ‘31-Dec-04’;
Explain the difference between a lookup list and a multiple-value list
What will be an ideal response?