four separate er diagrams visio files

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For the following four scenarios (two should be familiar!) create separate ER diagrams that include all entities needed to meet the business requirements, along with appropriate attributes. Each ERD should: • Indicate cardinality through the use of proper Crow’s Feet notation • Indicate all primary and foreign keys • Indicate strong or weak relationships between entities • Have “verbs” identifying the relationship between entities (i.e a student ENROLLS in a section) • On at least one relationship per diagram, indicate exact cardinality due to a business rule using (x,y) notation. For example, a student can enroll in 0 to 7 classes or a professor can teach 0 to 4 classes)

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