Each local storage device on a Windows-based computer is identified by a unique device letter, which for the hard disk is usually _____.
A. A
B. C
C. B
D. D
Answer: B
Computer Science & Information Technology
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const, dobule, and int are examples of _________.
a. identifiers b. variables c. reserved words d. compiler directives e. program comments
Computer Science & Information Technology
Use the schema R in the following questions:
R = (ABCDEFGH, {BE ? GH, G ? FA, D ? C, F ? B})
(a) What is a key of R?
(b) What is the attribute closure of GH ?
(c) Can there be a key that does not contain D? If such a key exists, give it; otherwise explain why it is not possible.
(d) Is the schema in BCNF? Give the reason for your answer.
(e) Use one cycle of the BCNF synthesis algorithm to decompose R into two sub-relations. For each sub-relation, explain whether or not it is in BCNF.
(f) Give the general condition that guarantees that a decomposition is lossless. Apply the condition to your decomposition to show whether or not it is lossless.
(g) Give the general condition that guarantees that a decomposition is dependency preserv- ing. Apply the condition to your decomposition to show whether or not it is dependency preserving.
(h) * Consider a schema (R, ), where R is a set of attributes and is a set of functional dependencies. Assume further that
Computer Science & Information Technology
C++ and Java are examples of ____ languages.
A. low-level programming B. high-level programming C. machine D. assembly
Computer Science & Information Technology
FIGURE EX 1-1
To change the location of the Quick Access Toolbar, which command would you select on the menu shown in Figure EX 1-1 above?
A. Quick Print B. Sort Ascending C. Open D. Show Below the Ribbon
Computer Science & Information Technology