Download Advances in Computers, Vol. 35 by Marshall C. Yovits PDF

By Marshall C. Yovits

This quantity in a chain detailing recommendations in all points of machine technology, is worried with relational databases, tactile details processing and research, object-oriented process improvement tools; opposite engineering, multiprocessing, overseas computing, and others.

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To indicate the possibility of overlapping domains an o is placed in a circle in the graphical representation of a subset hierarchy. Figure 10 shows the graphical representation of generalization and subset hierarchy. We assume a student may be graduate in a major and undergraduate in a second major. FIG. 10. Generalization and subset hierarchy. DESIGN OF RELATIONAL DATABASES 35 In some cases the need arises to model a single subclass having more than one superclass, where the superclasses represent different entity types.

1992). For assigning a student to a course we made the following assumptions: A student has to request the assignment to a particular course. In order to process the request, the system must first store the request in a request log. After this, the request is processed by first checking the necessary requirements for attending the course. 6. A high-level DFD. 7. DFD of course registration. requirements log. The course history of students are stored in the course/ student log and compared with the requirements necessary for attending the course in process four.

From the final F-schema we can further see that a negative admission log exists. It contains information about a course and the students that could not be assigned to the course because they did not meet the necessary requirements. This fact is represented by the entity type Negative-Admission in the Dschema. Similar to the Course/Student entity type, we assume that there is no relationship from the entity type Negative-Admission to entity type Course for reasons outlined earlier. Finally, we have to change the role of the relationship type requests between entity types Student and Course to attends because the relationship is valid only for students who could be assigned to the corresponding courses.

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