The business rules derived from the case study are;
The following assumptions are made on top of the derived business rules;
Normalization occurs in 3 steps
Following the three levels of normalization, the following relations are derived from the Entity Relationship Diagram.
Lessons (lessonID, coursed, duration, date)
Course_enrollment (enrollmentID, studentID, courseID)
All relations are in 3NF because no transitive dependencies exist in any relation. This can be shown by showing the functional dependency in each relation where every non-key attribute depends on a key attribute or on the primary key of the relation
All relations have functional dependencies existing between the attributes.
(lessonID)à(coursed, duration, date)
From the set of functional dependencies shown above all the relations are in 3NF because there is no transitive dependency present in any relation.
Czenky, M. (2010). Normalization based on dependency diagram. Teaching Maths and Computer Science, 1-121. Retrieved May 3, 2017, from http://tmcs.math.unideb.hu/load_doc.php?p=188&t=doc
Watt, A. (n.d.). Database Design:Chapter 11 Functional Dependencies. Retrieved May 3, 2017, from https://opentextbc.ca/dbdesign/chapter/chapter-11-functional-dependencies/
Watt, A. (n.d.). Database Design:Chapter 12 Normalization. Retrieved May 3, 2017, from https://opentextbc.ca/dbdesign/chapter/chapter-12-Normalization/
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