Chapter10(pdf) - KFUPM Open Courseware

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EXAMPLE OF AN INSERT ANOMALY • Consider the relation: • EMP_PROJ(Emp#, Proj#, Ename, Pname, No_hours) • Insert Anomaly: • Cannot insert a project unless an employee is assigned to it. • Conversely • Cannot insert an employee unless he/she is assigned to a project. Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 10- 12
EXAMPLE OF AN DELETE ANOMALY • Consider the relation: • EMP_PROJ(Emp#, Proj#, Ename, Pname, No_hours) • Delete Anomaly: • When a project is deleted, it will result in deleting all the employees who work on that project. • Alternately, if an employee is the sole employee on a project, deleting that t employee would result in deleting the corresponding project. Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 10- 13
Page 1 and 2: Copyright © 2007 Ramez Elmasri and
Page 3 and 4: Chapter Outline • Informal Design
Page 5 and 6: Informal Design Guidelines for Rela
Page 7 and 8: A simplified COMPANY relational dat
Page 9 and 10: Two relation schemas suffering from
Page 11: EXAMPLE OF AN UPDATE ANOMALY • Co
Page 15 and 16: Null Values in Tuples • GUIDELINE
Page 17 and 18: Copyright © 2007 Ramez Elmasri and
Page 19 and 20: Functional Dependencies (1) • Fun
Page 21 and 22: Examples of FD constraints • Soci
Page 23 and 24: Normalization of Relations • Norm
Page 25 and 26: Definitions of Keys and Attributes
Page 27 and 28: Normalization into 1NF Copyright ©
Page 29 and 30: Second Normal Form (1) • Uses the
Page 31 and 32: Normalizing into 2NF Copyright © 2
Page 33 and 34: Third Normal Form (2) • A relatio
Page 35 and 36: Normal Forms Defined Informally •
Page 37 and 38: General Normal Form Definitions (2)
Page 39 and 40: BCNF (Boyce-Codd Normal Form) • A
Page 41 and 42: A relation TEACH that is in 3NF but

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