Contract employees-or simply contractors-should not be allowed to do what?
A. Work on the premises.
B. Wander freely in and out of facilities.
C. Visit the facility without an escort.
D. Be compensated based on hourly rates.
Answer: B
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Which of the following is NOT a column in a folder window?
A) Type B) Title C) Name D) Size
A company sells merchandise through agents. Each sales agent is assigned one or more cities to cover. Consider the following schema, where the keys are underlined:
Transaction means that item i was sold on date d in the area with zip code z.)
Consider the following query:
Show the three ?most promising? relational algebra expressions that the query optimizer is
likely to consider; then nd the most ecient query plan and estimate its cost.
Assume 50 bu er pages and the following statistics and indices:
Agent: 1,000 tuples, 5 tuples/page; 200 agents.
Clustered hash index on Name.
Unclustered B+ tree index on City.
Location: 2500 tuples, 50 tuples/page; 500 cities.
Unclustered hash index on ZIP.
Transaction: 10,000 tuples, 20 items; 10 tuples/page.
2-level clustered B+ tree index on Item.