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The Software Infrastructure for Electronic Commerce

The Software Infrastructure for Electronic Commerce

The Software Infrastructure for Electronic Commerce. Databases and Data Mining Lecture 2: Data Warehousing Johannes Gehrke johannes@cs.cornell.edu http://www.cs.cornell.edu/johannes. Overview. Conceptual design Querying relational data

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814 views • 61 slides
The Entity-Relationship Model

The Entity-Relationship Model

The Entity-Relationship Model. Chapter 2. Database Design Process. Requirement collection and analysis DB requirements and functional requirements Conceptual DB design using a high-level model Easier to understand and communicate with others Logical DB design (data model mapping)

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569 views • 24 slides
The Entity-Relationship Model

The Entity-Relationship Model

The Entity-Relationship Model. Chapter 2. Overview of Database Design. Conceptual design : ( ER Model is used at this stage.) What are the entities and relationships in the enterprise? What information about these entities and relationships should we store in the database?

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316 views • 23 slides
The Entity-Relationship Model

The Entity-Relationship Model

The Entity-Relationship Model. Chapter 2. Overview of Database Design. Conceptual design : ( ER Model is used at this stage.) What are the entities and relationships in the enterprise? What information about these entities and relationships should we store in the database?

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233 views • 23 slides
The Entity-Relationship Model

The Entity-Relationship Model

The Entity-Relationship Model. Chapter 3+4. Priorities when Designing an E/R Diagram. Express all constraints (you can express!) Use and do not change terminology and class structure of the application domain Keep it simple (avoid defining entity types that do not serve any purpose

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384 views • 20 slides
The Entity-Relationship Model

The Entity-Relationship Model

The Entity-Relationship Model. Chapter 2. Database Design Basics: Six Steps in Design. Data Requirements Analysis: a) what must be stored, b) how will it be used, and c) what actions occur most often. Conceptual Database Design: Use ERD(s) to group data into entities and relationships.

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171 views • 9 slides

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