Solution manual for fundamentals of database systems 6th edition

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Related Audiobooks Free with a 30 day trial from Scribd. Publishing as Pearson Addison-Wesley. Answers: a No constraint violations.

FARES are kept for each flight. This assumes that the reservation has only one seat. More complex operations will be needed for a more realistic reservation that may reserve several seats at once. Give what you think should be various candidate keys and write in your own words under what constraints each candidate key would be valid.

For example, if the sections of a particular course during a particular semester are numbered 1, 2, 3, Assume that an order can be shipped from several warehouses. Specify the foreign keys for this schema, stating any assumptions you make. What other constraints can you think of for this database? Answer: Strictly speaking, a foreign key is a set of attributes, but when that set contains only one attribute, then that attribute itself is often informally called a foreign key.

The schema of this question has the following five foreign keys: 1. We now give the queries in relational algebra: 5. Answer: The schema of this question has the following two foreign keys: 1. We now give the queries in relational algebra: 3. Answer: The schema of this question has the following four foreign keys: 3. However, Social Security Number is usually stored in one attribute. The decision is usually based on how the database will be used. This exercise asks you to think about specific situations where dividing the SSN is useful.

Answer: a. We need the area code also know as city code in some countries and perhaps the country code for dialing international phone numbers. Referential integrity constraints are shown as directed arcs in Figure 6. Answer: a Retrieve the names of employees in department 5 who work more than 10 hours per week on the 'ProductX' project.

LNAME, e. FNAME, e. Answer: c For each section taught by professor King, retrieve the course number, semester, year, and number of students who took the section. Transcript includes course name, course number, credit hours, semester, year, and grade for each course completed by the student. Name, c. CourseName, c. CourseNumber, c. CreditHours, t. Semester, t. Year, g. StudentNumber AND g. SectionIdentifier AND t. Name, s. StudentNumber OR g. What is the effect of having a smaller number of join conditions?

Answer: Typically, there should be at least n-1 join conditions; otherwise, a Cartesian product with one of the range relations would be taken, which usually does not make sense. Related Papers. A query language for EER schemas.