____ transmission systems are similar to terrestrial microwave systems except that the signal travels from a ground station on Earth to a satellite and back to another ground station on Earth.?
A. ?Satellite microwave
B. ?Cellular
C. ?Downlink
D. ?Terrestrial microwave
Answer: A
Computer Science & Information Technology
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What is x after the following statements?
``` int x = 1; x *= x + 1; ``` a. x is 1. b. x is 2. c. x is 3. d. x is 4.
Computer Science & Information Technology
Consider the following schema, where the keys are underlined (di?erent keys are underlined di?erently):
Professor(Id, Name, Department) Course(CrsCode, Department, CrsName) Teaching(ProfId, CrsCode, Semester)Consider the following query:
SELECT C.CrsName, P.Name
FROM Professor P, Teaching T, Course C
WHERE T.Semester=’F1995’ AND P.Department=’CS’
AND P.Id = T.ProfId AND T.CrsCode=C.CrsCode
Assume the following statistical information:
1. 1000 tuples with 10 tuples per page in Professor relation
2. 20,000 tuples with 10 tuples per page in Teaching relation
3. 2000 tuples, 5 tuples per page, in Course
4. 5-page bu?er
5. 50 di?erent values for Department
6. 200 di?erent values for Semester
7. Indices
Professor relation
On Department: Clustered, 2-level B+ tree
On Id: Unclustered, hash
Course relation
On CrsCode: Sorted (no index)
On CrsName: Hash, unclustered
Teaching relation
On ProfId: Clustered, 2-level B+-tree
On Semester, CrsCode: Unclustered, 2-level B+ tree
a. First, show the unoptimized relational algebra expression that corresponds to the above SQL query. Then draw the corresponding fully pushed query tree.
b. Find the best execution plan and its cost. Explain how you arrived at your costs.
Computer Science & Information Technology
The best way to prevent information loss through dumpster diving is to use a shredder
Indicate whether the statement is true or false.
Computer Science & Information Technology
The PHP Extension and Application Representation (PEAR) is a committee that oversees the open source PHP code.
Answer the following statement true (T) or false (F)
Computer Science & Information Technology