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Describe the difference ways of implementing one-to-one relationships. Assume you are maintaining information on offices (office numbers, building, and phone numbers) and faculty (numbers and names). No office houses more than one faculty member; no faculty member is assigned more than one office. Illustrate the ways of implementing one-to-one relationships using offices and faculty. Which option would be best in each of the following situations?
a. A faculty member must have an office, and each office must be occupied by a faculty member. b. A faculty member must have an office, but some offices are not currently occupied. You must maintain information about the unoccupied offices in an Office relation. c. Some faculty members do not have an office but all offices are occupied. d. Some faculty members do not have an office, but some offices are not occupied.
Create use case to describe a typical sales process. Then make a sequence diagram for use case.
Design a nested menus interface for a check-in and check-out hotel reservation system that can be used internationally.
Write a query that performs an inner join of the grade, student, and grade_type tables using ANSI SQL 99 syntax (JOIN ON).
How can you make your database more hacker proof? How do you ensure the security of an organizations distributed database?
List the sequence of relational algebra operations needed to implement the queries.
Several times, database triggers are utilized to record logins by users. Here is the example of login trigger that inserts row into table every time a user connects.
Create a database for Ray. He is interested in movies and wants to keep information on movies, actors, and directors in a database. The only user is Ray, and he needs to produce reports.
Express given five loosely described problems carefully in { Instance, Question } form as utilized in "Computers and Intractability". Determine that a list of n numbers has no duplicates.
Using your knowledge of the college environment, determine the functional dependencies that exist in the following?
Complete database exercise by converting user form located the evaluation procedures section of the syllabus into 1NF and 2NF.
It is not uncommon to have to access the data which reside in different tables, especially when formulating a report.
What are triggers used for, and why are they important in database systems? Provide an example of a situation where a trigger would be appropriate.
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