In a folder window, the ________ button updates the view and displays any updates to contents in the selected location
Fill in the blank(s) with correct word
Refresh
Computer Science & Information Technology
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The active control is said to have the ________.
Fill in the blank(s) with the appropriate word(s).
Computer Science & Information Technology
________ are nouns or short phrases that illustrate your experience, education, and other important information
A) Identifiers B) Keywords C) Descriptors D) Buzzwords
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 Word themes used for an ordinary document can also be used for a Web page document
Indicate whether the statement is true or false
Computer Science & Information Technology