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Unit05 dbms

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arnold 7490

The document discusses database schema refinement through normalization. It introduces the concepts of functional dependencies and normal forms including 1NF, 2NF, 3NF and BCNF. Decomposition is presented as a technique to resolve issues like redundancy, update anomalies and insertion/deletion anomalies that arise due to violations of normal forms. Reasoning about functional dependencies and computing their closure is also covered.

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[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Evils of Redundancy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
INTRODUCTION TO SCHEMA REFINEMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Use of Decompositions ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],7 5 10 8 hourly wages rating
40 8 35 Madayan 612-67-4134 32 5 35 Guldu 434-26-3751 30 5 35 Smethurst 131-24-3650 30 8 22 Smiley 231-31-5368 40 8 48 Attishoo 123-22-3666 hours worked rating lot name ssn
Problems Related to Decomposition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Functional Dependencies (FDs) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Constraints on Entity Set ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example (Contd.) ,[object Object],[object Object],[object Object],[object Object],Hourly_Emps2 Wages
Constraints on a Relationship Set ,[object Object],[object Object],[object Object],[object Object],[object Object]
Reasoning About FDs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reasoning About FDs (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reasoning About FDs (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Closure of a Set of FDs ,[object Object],[object Object],[object Object],[object Object]
Closure of a Set of FDs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Attribute Closure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
NORMAL FORMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Normal Forms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
First Normal Form ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Second Normal Form ,[object Object],[object Object],[object Object],[object Object]
Second Normal Form ( Contd) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Third Normal Form ,[object Object],[object Object],[object Object],[object Object],[object Object]
Third Normal Form (Contd) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Boyce-Codd Normal Form (BCNF) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Third Normal Form (3NF) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Decomposition of a Relation Scheme ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example Decomposition ,[object Object],[object Object],[object Object],[object Object],[object Object]
Problems with Decompositions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lossless Join Decompositions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
More on Lossless Join ,[object Object],[object Object],[object Object],[object Object]
Dependency Preserving Decomposition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Dependency Preserving Decompositions (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Decomposition into BCNF ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BCNF and Dependency Preservation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Decomposition into 3NF ,[object Object],[object Object],[object Object],[object Object],[object Object]
SCHEMA REFINEMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Constraints on a Relationship Set ,[object Object],[object Object],[object Object]
Identifying Attributes of Entities ,[object Object],[object Object],[object Object],[object Object]
Identifying Entity Sets ,[object Object],[object Object],[object Object],[object Object],[object Object]
Multivalued Dependencies ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Join Dependencies ,[object Object],[object Object],[object Object],[object Object]
Fifth Normal Form ,[object Object],[object Object],[object Object],[object Object],[object Object]
Inclusion Dependencies ,[object Object],[object Object],[object Object],[object Object]

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