'Ssn lot' presentation slideshows

Entity-Relationship (E-R) Model

988 views • 58 slides

ER continued, and ER to Relational Mappings

ER continued, and ER to Relational Mappings. R&G Chapters 2, 3 Lecture 22. Administrivia. Homework 4 Due Tuesday Today: More on the ER Model & DB Design Next week: Concurrency Control & Recovery. name. cost. pname. age. ssn. lot. Policy. Dependents. Employees. Review: the ER Model.

395 views • 28 slides

Introduction to MIS Databases

297 views • 14 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.

249 views • 7 slides