Which of the following statements is false?
a. Assigning an object to a variable binds (associates) that variable’s name to the object. You can then use the variable in your code to access the object’s value.
b. After the following snippet’s assignment, the variable x refers to the integer object containing 7.
x = 7
c. The following statement changes x’s value:
x + 10
d. The following statement changes x’s value:
x = x + 10
c. The following statement changes x’s value:
x + 10
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A PBX provides
a. local loops to each employee’s desk b. a phone-company owned solution c. no advanced features d. the ability to have more employee station lines than local loops
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
The latest version of the Windows operating system is ________
A) Windows 8 B) Windows RT C) both A and B D) neither A or B
When would you use the Color Range effect?
The following questions are not in the student's Classroom in a Book. What will be an ideal response?