Reference no: EM13851658
Task Background: Relations and functions are important in data management, particularly in the retrieval of data. It is important to know whether associations between data are unique or ambiguous.
Primary Task Response: Write at least 3 paragraphs that respond to the following questions with your thoughts, ideas, and comments. This will be the foundation for future discussions by your classmates. Be substantive and clear, and use examples to reinforce your ideas.
Part I
Research the term primary key. Discuss what this means in the context of functions and relations. Describe an example of the use of a primary key.
Part II
Consider the example of the states of the United States and the senators of the United States. If you consider the set of states as a domain and the set of senators as a range, you can establish a relation based on associations between the senators and the states. This relation would not be a function because each state corresponds to more than one senator. However, if you reverse the roles of the domain and range, then the relation is a function because each senator is associated with only one state.
Make up your own example of 2 real-world sets - each with more than one element - and describe how the elements of the different sets can be paired, such that
• if one set is considered the domain and the other the range, then the relation is not a function, and
• if the roles (domain and range) of the two sets are reversed, then the relation is a function.
|
A library research and industry related project
: A library research and industry related project is to be carried out on a topic of your choice. The project topic must be related to Data Communications and Networking.
|
|
Calculate confidence intervals around the p and q
: Calculate confidence intervals around the P and Q percentages using the following sample data: a. P = 75% , Q = 25% n= 678 @ 95% level of confidence b. P = 75%, Q = 25% n= 35 @ 95% level of confidence
|
|
Acquisition analysis -mergers and acquisitions
: Acquisition Analysis -mergers and acquisitions, Suppose you offer an exchange ratio such that, at current preannouncement share prices for both firms, the offer represents a 20% premium to buy TargetCo. What will your earnings per share be after the ..
|
|
How does social class affect
: How does social class affect the way individuals are perceived and handled in this society as it relates to juvenile delinquency? (250 words, cite sources, Juvenile Delinquency Class)
|
|
Describe an example of the use of a primary key
: Discuss what this means in the context of functions and relations. Describe an example of the use of a primary key.
|
|
Montag walked from the subway with the money
: Montag walked from the subway with the money in his pocket (he had visited the bank, which was open all night every night with robot tellers in attendance) and as he walked he was listening to the Sea-shell Radio in one ear...'We have mobilized a mil..
|
|
Developing a statistical database
: Suppose you are developing a statistical database in which information about professional football teams and records are stored. Consider the following 2 sets of data that list football teams and quarterbacks
|
|
A salon sells its cologne wholesale
: A salon sells its cologne wholesale for $8.75 per bottle. The variable cost of producing ,X hundred bottle is -3x2+511X-325 dollars
|
|
Find the cost of the premier package to the nearest cent
: The total cost of her new car was $34,290.08 which included the 6.5% sales tax. Find the cost of the Premier Package to the nearest cent.
|