'First normal form' diaporamas de présentation

Chapter 7: Relational Database Design

Chapter 7: Relational Database Design. The Banking Schema. branch = ( branch_name , branch_city , assets ) customer = ( customer_id , customer_name , customer_street , customer_city ) loan = ( loan_number , amount ) account = ( account_number , balance )

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Outline: Normalization

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Relational Database Systems

Relational Database Systems. Higher Information Systems. The Relational Model. data is grouped into entities which are related, in order to minimise data duplication and achieve data integrity many-to-many relationships between entities are removed and replaced with one-to-many relationships.

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Normalization of Database Tables

Normalization of Database Tables. In this chapter, you will learn:. What normalization is and what role it plays in the database design process About the normal forms 1NF, 2NF, 3NF, BCNF, and 4NF How normal forms can be transformed from lower normal forms to higher normal forms

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A Guide to MySQL

2. Database Design Fundamentals. A Guide to MySQL. Objectives. Understand the terms entity , attribute , and relationship Understand the terms relation and relational database Understand functional dependence and be able to identify when one column is functionally dependent on another

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A Guide to MySQL

2. Database Design Fundamentals. A Guide to MySQL. Objectives. Understand the terms entity , attribute , and relationship Understand the terms relation and relational database Understand functional dependence and be able to identify when one column is functionally dependent on another

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Chapter 15

Chapter 15. Functional Dependencies and Normalization for Relational Databases. Lecture # 14 July 21 ,2012. Redundant Information in Tuples and Update Anomalies. Grouping attributes into relation schemas Significant effect on storage space

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ITS232 Introduction To Database Management Systems

ITS232 Introduction To Database Management Systems . Siti Nurbaya Ismail Faculty of Computer Science & Mathematics, Universiti Teknologi MARA ( UiTM ), Kedah | sitinurbaya@kedah.uitm.edu.my | http://www.sitinur151.wordpress.com | | A2-3039 | ext:2561 | 012-7760562 |. CHAPTER 5

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Functional Dependencies and Normalization

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Normalization Concepts

Normalization Concepts. CIS 507 Database Programming. Introduction. Two types of Anomalies associated with databases. Modification Anomaly an unexpected consequence of changing the actual data in a database Design Anomaly a flaw in the logical design of the database itself

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Functional Dependency

Functional Dependency. CS157a Sec. 2 Koichiro Hongo. What is Functional Dependency?. A functional dependency is a constraint between two sets of attributes in a relation from a database. An attribute or set of attributes X is said to functionally determine another attribute

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Normalisation to 3NF

Normalisation to 3NF. Database Systems Lecture 11 Natasha Alechina. In This Lecture. Normalisation to 3NF Data redundancy Functional dependencies Normal forms First, Second, and Third Normal Forms For more information Connolly and Begg chapter 13

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Database Management

Database Management. Relational Databases and Data Normalization By: Prof. Thomas G. Re Nassau Community College. Tables in a relational DB. Tables can be created in a relational database where the columns (Fields) of the database are the labels on the top of the table.

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Database Design Issues, Part I

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Data Normalization

Chapter 7 Logical Database Design Relational Systems (Normalization) . Data Normalization. Primarily a tool to validate and improve a logical design so that it satisfies certain constraints that avoid unnecessary duplication of data

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Functional Dependency

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Normalization

Normalization. Normal Forms. If a relation is in a certain normal form ( BCNF, 3NF etc.), it is known that certain kinds of redundancies are avoided/minimized. This can be used to help us decide whether decomposing the relation will help. Role of FDs in detecting redundancy:

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BA471 Management Information Systems

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SQL Unit 15 Normalization

SQL Unit 15 Normalization. prepared by Kirk Scott. 1. Normal Forms 2. First Normal Form 3. Second Normal Form 4. Third Normal Form 5. Boyce- Codd Normal Form 6. Fourth Normal Form 7. Fifth Normal Form 8. Domain Key Normal Form 9. Nulls and Integrity. 1. Normal Forms.

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SQL Unit 17 Normalization

SQL Unit 17 Normalization. prepared by Kirk Scott. 1. Normal Forms 2. First Normal Form 3. Second Normal Form 4. Third Normal Form 5. Boyce- Codd Normal Form 6. Fourth Normal Form 7. Fifth Normal Form 8. Domain Key Normal Form 9. Nulls and Integrity. 1. Normal Forms.

230 views • 0 slides