____ creates an array of 10 PayRecord structures.
A. struct (PayRecord employee)[10];
B. struct[10] PayRecord employee;
C. struct PayRecord[10] employee;
D. struct PayRecord employee[10];
Answer: D
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If you wanted to find which value occurs most often in a cell range, you would use the ________ function
A) MEDIAN B) MEAN C) MODE.SNGL D) AVERAGE
Paragraphs formatted with the _________ are subordinate to Heading 1 paragraphs.? A. Heading 2 style B. Heading 1-1 style C. Heading 2.1 style D. Heading 1 style
Fill in the blank(s) with the appropriate word(s).
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.
In the accompanying figure, Item 1 points to the ____.
A. argument in an active cell B. task containing a cell reference C. row heading of an active cell D. returned value of a formula containing a function