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Chapter 4 Logical Database Design and the Relational Model

Chapter 4 Logical Database Design and the Relational Model. Jason C. H. Chen, Ph.D. Professor of MIS School of Business Administration Gonzaga University Spokane, WA 99258 chen@gonzaga.edu. #1-I(a), p.193. #1-I(b). Fig. 2-11: An associative entity (p. 78). #1-I (c).

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Chapter 4 Logical Database Design and the Relational Model

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  1. Chapter 4 Logical Database Design andthe Relational Model Jason C. H. Chen, Ph.D. Professor of MIS School of Business Administration Gonzaga University Spokane, WA 99258 chen@gonzaga.edu

  2. #1-I(a), p.193 #1-I(b)

  3. Fig. 2-11: An associative entity (p. 78) #1-I (c) (a) Attribute on a relationship (Link Attribute/Associative)

  4. Answer to: #1-I (c)

  5. #1-I (c) EMPLOYEE EmployeeiD EmployeeName BirthDate CERTIFICATE EmployeeID CourseID DateCompleted COURSE CourseID CourseTitle

  6. #1-III(c) 3NF

  7. #2-III-a (p.193) – from Fig3-6b (p. 121)

  8. #2-III-b (p.193) from Fig. 3-7a (p.122)

  9. #2-III-c (p.193) – from Fig.3-9 (p.124)

  10. #2-III-d (p.193) – from Fig. 3-10 (p.125)

  11. 3.The normal form for the relations are: (make sure that you know why and how to transform it to 3NF) a.   3NF b.    3NF c.    2NF CLASS (CourseNo, SectionNo, Room) ROOM (Room, Capacity) d.   1NF COURSE (CourseNo, CourseName) CLASS (CourseNo, SectionNo, Room) ROOM (Room, Capacity)

  12. Vendor_Name Part_No Address Unit_Cost Description Logic Chip Logic Chip Memory Chip Memory Chip Memory Chip 1234 1234 5678 5678 5678 Fast Chips Smart Chips Fast Chips Quality Chips Smart Chips Cupertino Phoenix Cupertino Austin Phoenix 10.00 8.00 3.00 2.00 5.00 Part_No Vendor_Name Part_No, Vendor_Name Description Address Unit_Cost 7. Transforming Table 4-3 to relations: (p194) a) PART SUPPLIER b) c) Insert anomaly: we cannot insert a new vendor unless we also include a part number. Delete anomaly: if we delete part information, we also lose information about a vendor who supplies that part. Modification anomaly: if a vendor address changes, we have to modify all records (or rows) for that vendor.

  13. Part_No Description Vendor_Name Address Unit_Cost PART SUPPLIER Part_No Description Part_No Vendor_Name Unit_Cost Vendor_Name Address 7. d) e) 1NF f)

  14. 7. g)

  15. 8. a) partial dep. partial dep. transitive dep. b) 1NF

  16. 8. c) 3NF after remove partial & transitive dep.

  17. 3NF after remove partial & transitive dep. 8. d)

  18. 8. e) Using MS/Visio

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