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Figure 8-1 Example entity-relationship (E-R) diagram. The lines represent relationships between entities, and the marks at the ends of the lines represent the cardinalities. A circle at the end of a line means that the relationship is optional with respect to that entity; a bar at the end of a line means that only one instance of that entity type may participate in an instance of the relationship; and a crows foot means that many instances of that entity type may participate in an instance of the relationship. For instance, a single department offers one or many courses; every department offers at least one course. Also, a dorm may be associated with one or many students, and a student may be associated with no dorm, or with one dorm. Some students are commuters who will not be associated with a dorm, but if a student is associated with a dorm, the student is associated with at most one dorm. These processes of defining entities, their attributes, and the relationships among entities are effective for most entities and relationships. There are a few more special cases, however, that come up often enough to require some additional discussion. Some entities belong in the database only if another entity is already part of the database. For instance, we would include dependents of a professor in the database only if the professor were already included. If a professor leaves the university, the professor s information would be removed from the database, and it would no longer make sense to store information about the professor s dependents, either. An entity type such as Dependent is called a weak entity. A weak entity is modeled like other entity types, except that it is identified as being dependent upon a strong entity in the database. A particular type of weak entity is the ID-dependent entity. An ID-dependent entity is a weak entity, such that the ID of the associated strong entity is also part of the identifier of the ID-dependent entity. Imagine the strong entity Building and the ID-dependent entity Room . Attributes of a room may include size, seating capacity, number of windows, etc., but a room only makes sense in the context of a building, and the identity of a room will include the building name as well as the room number. Another application of ID-dependent entities occurs when attributes are multivalued. For instance, a professor may have more than one degree, or more than one telephone number. We model such multivalued
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attributes as ID-dependent entity types, and we specify 1:N relationships between the strong entity and the ID-dependent entities. Relationships may also be recursive. That is, a relationship can exist among instances of the same entity type. For example, we might want to model the relationship between students who room together. In that case, we would define a recursive N:M student:roommate relationship to model the fact that students may room with one or more others. If all rooms permitted only two roommates, the relationship could be 1:1, but probably some suites allow for three, four, or more roommates, so the relationship between student and roommates will be N:M, and we will call it rooms-with . The minimum cardinality on either side can be 0, if we have some students who will room alone. Finally, some entity types can represent subclasses and superclasses. For instance, students may be either undergraduate or graduate students. We would model student as the superclass, and we would model undergraduate and graduate as subclasses. Attributes of student would include those attributes relevant to all students, such as name, address, etc. Attributes of undergraduate entities would include those attributes relevant only to undergraduates, such as student life advisor (assuming graduate students have no such advisor assigned). Figure 8-2 illustrates weak and ID-dependent entities, multivalued attributes, and superclass and subclass entities.
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Figure 8-2 E-R diagram special cases. In Fig. 8-2, the Dependents table is an id-dependent weak entity. The identifier for that table includes the key for the related strong entity Faculty, plus the name of the dependent (spouse s name, child s name, etc.). The FacultyDegrees entity represents a multivalued attribute. A single faculty member may have multiple degrees from multiple institutions, and this entity allows us to represent that fact. Finally, the Student entity shows two subcategories of students, grads and undergrads. An undergrad will have a faculty member serving as his or her Student Life Advisor, and a grad may (or may not) have a faculty member serving as the chair of his or her thesis committee.
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