
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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E3

Transcribed Image Text:Consider a system that keeps track of people
using their names, social security numbers,
birthdays, addresses, and phone numbers.
Some of these people are workers, who also
have an employer and salary. The workers are
one of three types: • Teachers, who have a
grade level that they teach and a subject that
they teaching - Nurses, who have a specialty
and certifications • Programmers, who have a
set of languages that they know Draw an
entity/relationship diagram that describes this
system using generalization and specialization
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