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INEN625 Homework 5 Solution 2010

# INEN625 Homework 5 Solution 2010 - INEN625 Information...

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INEN625 Information Systems Homework 5 Due 4/19/10 Test Corrections DATA MODEL (Undergraduate Model) Consider the following IDEF 1X entity. STUDENTGRA DES StudentID (PK) MajorDept TotalGPA Semester1 Semester5 Semester1GPA Semester5GPA Semester2 Semester6 Semester2GPA Semester6GPA Semester3 Semester7 Semester3GPA Semester7GPA Semester4 Semester8 Semester4GPA Semester8GPA 1. Which normal form(s) are violated by the entity as shown? Why? First Normal Form – Semester (and associated GPA repeats) 2. What problems might be caused if this entity was put in the database as shown? Limited number of semesters could be entered without starting second record for student For student with few semesters – wasted space and thus slower search 3. Show the result of normalizing this entity in IDEF 1X format. StudentID (PK) StudentID(PK,FK) Semester (PK) MajorDept TotalGPA P SemesterGPA

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DATA MODEL (Graduate Model) Consider the following IDEF 1X entity. STUDENTGRA DES StudentID (PK) MajorDept DeptChair TotalGPA Semester1 Semester5 Semester1GPA Semester5GPA Semester2 Semester6 Semester2GPA Semester6GPA Semester3 Semester7 Semester3GPA Semester7GPA Semester4 Semester8 Semester4GPA Semester8GPA 1. Which normal form(s) are violated by the entity as shown? Why? First Normal Form – Semester (and associated GPA repeats)
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INEN625 Homework 5 Solution 2010 - INEN625 Information...

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