Examine the following entity relationship diagram, and select all statements that correctly describe this diagram.
Examine the following entity relationship diagram, and select all statements that correctly describe this diagram.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Examine the following entity relationship diagram, and select all statements that correctly describe this diagram.
PHOTOGRAPHER
PK PHOTOGRAPHER ID
FIRST_NAME
LAST_NAME
++
uses
PK
+PK,FK1
CAMERA
MODEL NR
PHOTOGRAPHER ID
DESCRIPTION
a. The CAMERA entity has a composite primary key.
Ob. The existence of each CAMERA instance depends upon the existence of a PHOTOGRAPHER instance.
c. Each CAMERA instance is associated with exactly one PHOTOGRAPHER instance.
d. A PHOTOGRAPHER uses one or more CAMERAS.
e. Both PHOTOGRAPHER and CAMERA are strong entities.
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