Most browsers include help for all of the following EXCEPT:
A. ?how to use the browser
B. ?how to customize the browser
C. ?how to customize the browser
D. ?how to create your own webpages
Answer: D
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Polymorphism means ______________.
a. that data fields should be declared private b. that a class can extend another class c. that a variable of supertype can refer to a subtype object d. that a class can contain another class
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.
Each column of a table represents a "Stack" which holds multiple pieces of data, such as first/last name and address of a single customer
Indicate whether the statement is true or false
The ____ protocol is responsible for opening email processing software when a link is clicked.
A. http:// B. email C. mailto: D. ftp://