The Silicon Valley university database stores details about university students, courses, the semester a student took a particular course (and his mark and grade if he completed it), and what degree program each student is enrolled in. The database is a long way from one that'd be suitable for a large tertiary institution, but it does illustrate relationships that are interesting to query, and it's easy to relate to when you're learning SQL. We explain the requirements next and discuss their shortcomings at the end of this section.
Consider the following requirements list:
The ER diagram derived from our requirements is shown in Figure 4-12. Although it is compact, the diagram uses some advanced features, including relationships that have attributes and two many-to-many relationships.
In our design:
Figure 4-12. The ER diagram of the university database
university management system
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Extended ER diagram is a variant of ER diagram. EER include ER diagram + hierarichal concept. Extended ER diagram is also called Enhance ER diagram(EER).
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