lecture-17-3nf

lecture-17-3nf - Third Normal Form T M Murali November 3...

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Unformatted text preview: Third Normal Form T. M. Murali November 3, 2010 T. M. Murali November 3, 2010 CS 4604: Third Normal Form Preserving FDs in a Decomposition I Consider the relation Teach(CourseNumber, DepartmentName, Professor, Semester, Year) I The relation models which courses a professor teaches in which semester. I Do not assume that each course is taught by at most one professor. T. M. Murali November 3, 2010 CS 4604: Third Normal Form Preserving FDs in a Decomposition I Consider the relation Teach(CourseNumber, DepartmentName, Professor, Semester, Year) I The relation models which courses a professor teaches in which semester. I Do not assume that each course is taught by at most one professor. I University introduces two new rules: 1. Each professor teaches ≤ 1 course per semester. 2. Each course is taught either in the fall every year or in the spring every year. T. M. Murali November 3, 2010 CS 4604: Third Normal Form Preserving FDs in a Decomposition I Consider the relation Teach(CourseNumber, DepartmentName, Professor, Semester, Year) I The relation models which courses a professor teaches in which semester. I Do not assume that each course is taught by at most one professor. I University introduces two new rules: 1. Each professor teaches ≤ 1 course per semester. PSY → CD 2. Each course is taught either in the fall every year or in the spring every year. T. M. Murali November 3, 2010 CS 4604: Third Normal Form Preserving FDs in a Decomposition I Consider the relation Teach(CourseNumber, DepartmentName, Professor, Semester, Year) I The relation models which courses a professor teaches in which semester. I Do not assume that each course is taught by at most one professor. I University introduces two new rules: 1. Each professor teaches ≤ 1 course per semester. PSY → CD 2. Each course is taught either in the fall every year or in the spring every year. CD → S T. M. Murali November 3, 2010 CS 4604: Third Normal Form Preserving FDs in a Decomposition I Consider the relation Teach(CourseNumber, DepartmentName, Professor, Semester, Year) I The relation models which courses a professor teaches in which semester. I Do not assume that each course is taught by at most one professor. I University introduces two new rules: 1. Each professor teaches ≤ 1 course per semester. PSY → CD 2. Each course is taught either in the fall every year or in the spring every year. CD → S I What are the keys? T. M. Murali November 3, 2010 CS 4604: Third Normal Form Preserving FDs in a Decomposition I Consider the relation Teach(CourseNumber, DepartmentName, Professor, Semester, Year) I The relation models which courses a professor teaches in which semester. I Do not assume that each course is taught by at most one professor....
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lecture-17-3nf - Third Normal Form T M Murali November 3...

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