'Transitive dependencies' diaporamas de présentation

Week 11 November 7

Week 11 November 7. Data Normalization and ERD Conceptual, Logical and Physical Database Design. Data Normalization. The purpose of normalization is to produce a stable set of relations that is a faithful model of the operations of the enterprise. Achieve a design that is highly flexible

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Normalization

Normalization. Part 1: The Concept. Objectives. How to undertake the normalization process . How normalization uses functional dependencies to group attributes into relations that are in a known normal form. How to identify the most commonly used normal forms:

581 views • 58 slides

Logical Database Design (2 of 3)

Logical Database Design (2 of 3). John Ortiz. Finding All Candidate Keys (cont.). Method 2 (manual approach): Step 1: Draw the dependency graph of F. Each vertex corresponds to an attribute. Edges can be defined as follows: A ? B becomes A B

564 views • 42 slides

Maven 2

The Maven Team @ Apache. Maven 2. Overview. What's new in Maven 2.0 Maven 2.0 and Ant ... and anything else you'd like to know about. Maven 2.0. Is a complete rewrite from Maven 1.0/1.1 Scheduled for beta testing in July, final release in August Built around reusable libraries:

657 views • 41 slides

CS263 Lecture 20 Revision on Normalisation

CS263 Lecture 20 Revision on Normalisation. LECTURE PLAN. Purpose of Normalisation Redundancy and Data Anomalies Repeating Groups Functional Dependency Transitive Dependency Stages of Normalisation. Purpose of Normalisation.

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216 views • 21 slides

Normalization 2

M Taimoor Khan taimoorkhan@ciit-attock.edu.pk. Normalization 2. Course Objectives. Basic Concepts Tools Database architecture and design Flow of data (DFDs) Mappings (ERDs) Formulating queries (Relational algebra) Implementing Schema Built-in Functions Extracting data

330 views • 20 slides

Functional Dependencies & Normalization

Functional Dependencies & Normalization. Souhad M. Daraghma. Redundancy and Normalisation. Redundant Data Can be determined from other data in the database Leads to various problems INSERT anomalies UPDATE anomalies DELETE anomalies. Redundancy and Normalisation. Normalisation

359 views • 17 slides

Avoiding Database Anomalies

Avoiding Database Anomalies. Unnormalized Relation. 3a. First Normal Form (1NF). A relation is in first normal form if it does not contain repeating groups. Unnormalized Relation. First Normal Form (1NF). Changes to service names have to be made on each line on which the the name appears.

1.09k views • 17 slides

Relational Database Appendix

Relational Database Appendix. Entity /relation. Entity Subtype. Relationship. Composite Entity. ER Diagram. Shorthand Description. State ( StateAbbrev , StateName, EnteredUnionOrder, StateBird, StatePopulation)

287 views • 17 slides