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Detailed Examples of Various One-to-one Relationships

Describe the different ways of implementing one-to-one relationships. Assume you are maintaining information on offices (office numbers, buildings, and phone numbers) and faculty (numbers and names). No office house 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.

Solution Preview

In this problem we see that there are two entities (faculty and office) and various relationships between them. Let's talk about these entities in terms of tables and the fields in those tables.

The first situation is that a faculty member must have an office, and each office must be occupied by a faculty member. This can be designed by using a single table called Faculty_Office that contains all of the information about the faculty and the office. No null values are allowed in the table.

Faculty_Office:
faculty_office_id (primary key)
faculty_name
faculty_number
office_number
office_building
office_phone

This table provides a ...

Solution Summary

This solution demonstrates how four different one-to-one relationships can be represented using tables in a relational database.

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