What is the difference between the E-R model and the extended E-R model?

EBK JAVA PROGRAMMING
9th Edition
ISBN:9781337671385
Author:FARRELL
Publisher:FARRELL
Chapter4: More Object Concepts
Section: Chapter Questions
Problem 9RQ
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What is the difference between the E-R model and the extended E-R model?

and explain the ER diagrams

EMPLOYEE+(1:NO DEPENDENT
DORMITORYe 1:N
STUDENT
BUILDING +1:N- APARTMENT
Transcribed Image Text:EMPLOYEE+(1:NO DEPENDENT DORMITORYe 1:N STUDENT BUILDING +1:N- APARTMENT
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