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Consider a relation R that has three attributes ABC. It is decom-posed into relations R1 with attributes AB and R2 with attributes BC.
1. State the definition of a lossless-join decomposition with respect to this example. Answer this question concisely by writing a relational algebra equation involving R, R1, and R2.
2. If you are given the following instances of R1 and R2, what can you say about the instance of R from which these were obtained? Answer this question by listing tuples that are de?nitely in R and tuples that are possibly in R.
Instance of R1 = {(5,1), (6,1)} Instance of R2 = {(1,8), (1,9)}
Can you say that attribute B de?nitely is or is not a key for R?
Create a database from scratch that contains, at a minimum, the elements listed below
Exceptions in credit card transactions can aid us fraudulent use of credit card. Suggest two methods for outlier detection.
If each instance for R listed above is legal, what can you say about the FD A → B?
Write a script that provides all of the information in, and duplicates the formatting of, Oracle's SQL*Plus describe command. Additionally, the output should add the comments on the rows. Input: owner and table name. Output: columns for Name, Null..
You have probably seen that already when you tried to create an E-R diagram. Visio uses notation and graphical shapes that are not the same as those in your text. If you look at some of the links to schemas, you will see a similar sort of thing.
a multinational tour operator agency has gained new business growth in the north american market through the use of
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What is meant by cardinality of a relationship? Your answer requires to be thorough and specific. Be sure to include the two types of cardinality
Construct (i) a use-case diagram (ii) a class diagram (iii) System Sequence Diagram (iv) detailed Sequence Diagram or diagrams as appropriate and (v) a state chart for a car object/class according this scenario. Include appropriate properties for ..
the strayer oracle server may be used to test and compile the sql queries developed for this assignment. your
Construct a relational schema for the ER-diagram. Make sure that you correctly translate Specialization and Many-to-Many relationships. Please follow carefully the following guidelines when you ?nish this question.
Assume you were a newly hired IT Security Manager at a software development company that in the past hasn't paid much attention to security, especially in its database development processes.
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