Examine the following entity relationship diagram, and select all statements that correctly describe this diagram.PHOTOGRAPHERPK PHOTOGRAPHER IDFIRST_NAMELAST_NAME++usesPK+PK,FK1CAMERAMODEL NRPHOTOGRAPHER IDDESCRIPTIONa. 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.

Primary Key is used to uniquely identify a column Foreign Key derives its data from primary key of…

Answered: Examine the following entity…

Engineering

Computer Science

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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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

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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