Chapter10(pdf) - KFUPM Open Courseware

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General Normal Form Definitions (1) • The above definitions consider the primary key only • The following more general definitions take into account relations with multiple candidate keys • A relation schema R is in second normal form (2NF) if every non-prime attribute A in R is fully functionally dependent on every key of R Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 10- 36
General Normal Form Definitions (2) • Definition: • Superkey of relation schema R - a set of attributes S of R that contains a key of R • A relation schema R is in third normal form (3NF) if whenever a FD X -> A holds in R, then either: • (a) X is a superkey of R, or • (b) A is a prime attribute of R • NOTE: Boyce-Codd normal form disallows condition (b) above Copyright © 2007 Ramez Elmasri and Shamkant B. Navathe Slide 10- 37
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 and 12: EXAMPLE OF AN UPDATE ANOMALY • Co
Page 13 and 14: EXAMPLE OF AN DELETE 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: Normal Forms Defined Informally •
Page 39 and 40: BCNF (Boyce-Codd Normal Form) • A
Page 41 and 42: A relation TEACH that is in 3NF but

Chapter10(pdf) - KFUPM Open Courseware

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