associative entity

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associative entity

associative entity

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Examples of multiple relationships – entities can be<br />

related to one another in more than one way<br />

Employees and departments

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Examples of multiple relationships – entities can be related to one another in more than one way Employees and departments

Professors and courses (fixed upon constraint)

Page 1 and 2: Data Processing AAOC C311 I Semeste
Page 3 and 4: Binary relationships
Page 5 and 6: Basic relationship with only maximu
Page 7 and 8: A binary relationship with an attri
Page 9: A unary relationship with an attrib
Page 13 and 14: Strong and weak entities Strong ent
Page 15 and 16: An associative entity (CERTIFICATE)
Page 17 and 18: Ternary relationship as an associat
Page 19 and 20: ER - Example © Prentice Hall, 2002
Page 21: Next Lecture on …. Enhanced ER ER