What is the extension for the NIS map data file?
A. .dat
B. .mpd
C. .pag
D. .dir
Answer: C
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Assume that each item has a different discount. The Total_price refers to one item, Odate is the date on which the order was placed, and the Total_amount is the amount of the order. If we apply a natural join on the relations Order-Item and Order in this database, what does the resulting relation schema look like? What will be its key? Show the FDs in this resulting relation. Is it in 2NF? Is it in 3NF? Why or why not? (State any assumptions you make.)
Consider the following relations for an order-processing application database at ABC, Inc. ORDER (O#, Odate, Cust#, Total_amount) ORDER-ITEM (O#, I#, Qty_ordered, Total_price, Discount%)
COGNITIVE ASSESSMENT You need to set up a computer to store and deliver email messages for your small business. Which of the following are you most likely to use?
A. network server B. mail server C. file server D. home server
?In data flow diagrams (DFD), systems analysts call an entity that supplies data to the system asink.
Answer the following statement true (T) or false (F)
Which of the following is not true about UNIX?
A. It is multiuser. B. It is multitasking. C. It is a network OS. D. It is only for supercomputers.