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Departments employees manages - PowerPoint PPT Presentation

The Entity-Relationship Model

The Entity-Relationship Model. courtesy of Joe Hellerstein for some slides. Jianlin Feng School of Software SUN YAT-SEN UNIVERSITY. The Entity-Relationship Model ? Toward a Unified View of Data. By Peter Pin-Shan Chen. In ACM Transaction on Database Systems (TODS), Vol. 1 (1), 1976.

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423 views • 25 slides

ER to Relational Mapping

ER to Relational Mapping. name. ssn. lot. Employees. Logical DB Design: ER to Relational. Entity sets to tables. CREATE TABLE Employees (ssn CHAR (11), name CHAR (20), lot INTEGER , PRIMARY KEY (ssn) ).

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Mapping E/R Diagrams to Relational Database Schemas

Mapping E/R Diagrams to Relational Database Schemas. Second Half of Chapter 3. E/R ? Relation Model (Example). since. since. name. name. dname. dname. ssn. did. did. budget. budget. lot. (0,*). (1,1). Departments. Employees. Manages. (0,*). hours_worked. (0,*). Works_In. ?.

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231 views • 13 slides

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Departments employees manages - PowerPoint PPT Presentation

The Entity-Relationship Model

ER to Relational Mapping

Mapping E/R Diagrams to Relational Database Schemas