'Policy dependents employees' diaporamas de présentation

Translation of ER-diagram into Relational Schema

CS 157A Lecture 7. Translation of ER-diagram into Relational Schema. Prof. Sin-Min Lee Department of Computer Science. Learning Objectives. Define each of the following database terms Relation Primary key Foreign key Referential integrity Field Data type Null value.

1.1k views • 64 slides

Relational Model to SQL

Relational Model to SQL. Data Model. Conceptual Design: ER to Relational to SQL. How to represent Entity sets, Relationship sets, Attributes, Key and participation constraints, Subclasses, Weak entity sets . . . ?. Problem Solving Steps.

505 views • 36 slides

MIS710 Module 1a Data and Process Modeling

368 views • 27 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) ).

307 views • 12 slides

Key Constraints

since. name. dname. ssn. lot. Employees. Manages. Key Constraints. did. budget. Consider Works_In: An employee can work in many departments; a dept can have many employees. In contrast, each dept has at most one manager, according to the key constraint on Manages. Departments.

243 views • 7 slides