there is a thing that I don't understand in this ER Diagram, which is the circle that has (O) inside and connect Staff member with Tutor and lecturer. what is it exactly and what is the purpose of it. Matric NoStudentNameForenamesSumameTalarial NumExam Marktutorial roomNledbelongs toMODE SOL TIONStaff MemberMRoom_numbersTutorial GroupPractical MarkNCourselab roomNtaught byMResponsibilityTutorPart-time?LecturerStaff Nomanaged byForenameNameSurname1Job title

Answered: here is a thing that I don't understand…

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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there is a thing that I don't understand in this ER Diagram, which is the circle that has (O) inside and connect Staff member with Tutor and lecturer. what is it exactly and what is the purpose of it.

Matric No
Student
Name
Forenames
Sumame
Talarial Num
Exam Mark
tutorial room
N
led
belongs to
MODE SOL TION
Staff Member
M
Room_numbers
Tutorial Group
Practical Mark
N
Course
lab room
N
taught by
M
Responsibility
Tutor
Part-time?
Lecturer
Staff No
managed by
Forename
Name
Surname
1
Job title

Expert Solution

Step 1

Answer :

It is nothing but a sign which denotes or indicates that staff member may be a Tutor or may be a Lecturer or may be both. It is somehow similar to OR.

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