Critical Thinking QuestionsCase 1-1Sally is a very active real estate agent. She is looking to purchase a new computer so she can keep track of her client's accounts, access the Internet from anywhere in the city and touch-up photos of real estate properties. Sally decides that she will buy a desktop computer for her office as well as a mobile device for use on the road. For the desktop computer, she is trying to decide on an access provider, but she is unclear about the terminology and what she would get with each kind of provider. What can you tell her?
What will be an ideal response?
An access provider is a business that provides individuals and organizations access to the Internet free or for a fee. Access providers are categorized as ISPs, online service providers, and wireless Internet service providers. An ISP (Internet service provider) is a regional or national access provider. A regional ISP usually provides Internet access to a specific geographic area. A national ISP is a business that provides Internet access in cities and towns nationwide. National ISPs usually offer more services and have a larger technical support staff than regional ISPs. Examples of national ISPs are AT&T and EarthLink. In addition to providing Internet access, an online service provider (OSP) also has many members-only features such as instant messaging or their own customized version of a Web browser. The two more popular OSPs are AOL (America Online) and MSN (Microsoft Network). A wireless Internet service provider, sometimes called a wireless data provider, is a company that provides wireless Internet access to computers and mobile devices, such as smart phones and portable media players, with built-in wireless capability (such as Wi-Fi) or to computers using wireless modems or wireless access devices. Wireless modems usually are in the form of a USB flash drive or a card that inserts in a slot in a computer or mobile device. Examples of wireless Internet service providers include AT&T, Sprint Broadband Direct, T-Mobile, and Verizon Wireless.
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Consider the following relational schema:
Assume that keys are underlined and:
The relation Employee is sorted on the Id attribute.
In Department: Unclustered index on DeptName; clustered on Building. No other
indices.
Dozens of departments can reside in the same building.
(a) Write an SQL query that generates a table of employee names who work for department
?Sales? in building E213.
(b) Give the ?naive? translation of your SQL query into the relational algebra (as given by
the general translation of SQL to relational algebra.)
(c) Describe carefully and completely how you would actually most eciently evaluate the
above query. That is, list the precise sequence of relational operations to be performed,
the relations on which these operations are to be performed, and the methods to be used
to compute the result of each operation. (As part of the solution you will need to decide
which index to use and why.)
One of the more common uses of a presentation is to enhance a(n) _________________________ presentation.
Fill in the blank(s) with the appropriate word(s).
List seven types of networked devices.
What will be an ideal response?
Identify applications where biometric access control technology can be used.
What will be an ideal response?