In which scenario would you likely need to obtain a special code?
A) if your computer crashes in the middle of installation
B) if your computer crashes and you need to install registered software on another computer
C) the first time you install a new program
D) when you install an upgrade to a program
B
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An exception’s ToString method returns all of the following except:
a) the name of the exception b) a stack trace c) the throw point d) the inner exception
Case 5-2 With all the types of Internet connections available, it's important to be able to keep them straight. These questions will test how well the options are understood. _____ is often the only broadband option for rural areas.
A. ?Digital Subscriber Line Internet access B. ?Fixed wireless Internet access C. ?Mobile wireless Internet access D. ?Satellite Internet access
Consider the following schema, where the keys are underlined:
``` Employee(SSN, Name,Dept) Project(SSN,PID,Name,Budget) ``` The SSN attribute in Project is the Id of the employee working on the project, and PID is the Id of the project. There can be several employees per project, but the functional dependency PID ? Name,Budget holds (so the relation is not normalized). Consider the query ``` SELECT P.Budget, P.Name, E.Name FROM Employee E, Project P WHERE E.SSN = P.SSN AND P.Budget > 99 AND E.Name = ’John’ ORDER BY P.Budget ``` Assume the following statistical information: 1. 10,000 tuples in Employee relation 2. 20,000 tuples in Project relation 3. 40 tuples per page in each relation 4. 10-page bu?er 5. 1000 di?erent values for E.Name 6. The domain of Budget consists of integers in the range of 1 to 100 7. Indices – Employee relation On Name: Unclustered, hash On SSN: Clustered, 3-level B+ tree – Project relation On SSN: Unclustered, hash On Budget: Clustered, 2-level B+ tree a. Draw the fully pushed query tree. b. Find the “best” execution plan and the second-best plan. What is the cost of each? Explain how you arrived at your costs.
Communications software usually is bundled with the operating system or communications devices.
Answer the following statement true (T) or false (F)