The document describes the construction of Entity-Relationship (E-R) diagrams for several scenarios. It includes steps to identify entity sets, attributes, relationships, and complete the E-R diagram. Scenarios include a car insurance company, tracking sports team matches and players, and a university registrar system with courses, offerings, students, and instructors. The diagrams show entities, attributes, and relationships between entities to model the data for each scenario.

1. UNIT 1
Lecture 8
E R Model

2. Question 2
•Construct an E-R diagram for a car-insurance
company whose customers own one or more
cars each. Each car has associated with it zero to
any number of recorded accidents.
Dinesh Kumar Bhawnani, BIT DURG

3. Step 1 : Identify the entity sets
• From the given question the entity sets identified are
1. PERSON
2. CAR
3. ACCIDENT
Dinesh Kumar Bhawnani, BIT DURG

4. Step 2 : Identify the relevant attributes
• The relevant attributes of PERSON entity set are
• Person_Id
• Person_Name
• Address
• The relevant attributes of CAR entity set are
• Engine_No
• Model
• Year
• The relevant attributes of ACCIDENT entity set are
• Report_No
• Location
• Acc_Date
Dinesh Kumar Bhawnani, BIT DURG

5. Step 3 : Identify the prime attributes
•The prime attribute of PERSON entity set is
•Person_Id
•The prime attribute of CAR entity set is
•Engine_No
•The prime attribute of ACCIDENT entity set is
•Report_No
Dinesh Kumar Bhawnani, BIT DURG

6. Step 4 : Identify the relationships
•Customers own one or more cars each.
Dinesh Kumar Bhawnani, BIT DURG
PERSON CARowns

7. Step 4 : Identify the relationships
•Each car is associated with it zero to any number
of recorded accidents.
Dinesh Kumar Bhawnani, BIT DURG

8. Step 4 : Identify the relationships
•Each car is associated with it zero to any number
of recorded accidents.
Dinesh Kumar Bhawnani, BIT DURG
PERSON CAR
participated
ACCIDENT

9. Step 5 : Complete E R Diagram
Dinesh Kumar Bhawnani, BIT DURG
PERSON CAR
participated
ACCIDENT
owns
Person_Id
Person_Name
Address
Model
Year
Engine_No
Report_No Location
Acc_Date
Damage_Amount

10. Question 3
• Design an E-R diagram for keeping track of the exploits
of your favorite sports team. You should store the
matches played, the scores in each match, the players
in each match and individual player statistics for each
match. Summary statistics should be modeled as
derived attributes.
Dinesh Kumar Bhawnani, BIT DURG

11. Step 1 : Identify the entity sets
• From the given question the entity sets identified are
1. MATCH
2. PLAYER
Dinesh Kumar Bhawnani, BIT DURG

12. Step 2 : Identify the relevant attributes
• The relevant attributes of MATCH entity set are
• Match_Id
• Stadium
• Date
• Opponent
• Own_Score
• Opp_Score
• The relevant attributes of PLAYER entity set are
• Player_Id
• Player_Name
• Summary_Score
Dinesh Kumar Bhawnani, BIT DURG

13. Step 3 : Identify the prime attributes
•The prime attribute of MATCH entity set is
•Match_Id
•The prime attribute of PLAYER entity set is
•Player_Id
Dinesh Kumar Bhawnani, BIT DURG

14. Step 4 : Identify the relationships
Dinesh Kumar Bhawnani, BIT DURG
MATCH PLAYERplayed

15. Step 5 : Complete E R Diagram
Dinesh Kumar Bhawnani, BIT DURG
MATCH PLAYERplayed
Match_Id
Opponent
Stadium
Own_Score Opp_Score
Date
Score Summary_Score
Player_Id Player_Name

16. Question 4
• Design an E-R diagram for keeping track of the exploits of your
favorite sports team. You should store the matches played, the scores
in each match, the players in each match and individual player
statistics for each match. Summary statistics should be modeled as
derived attributes.
• Extend the E-R diagram of the previous question to track the same
information for all teams in a league.
Dinesh Kumar Bhawnani, BIT DURG

17. Complete E R Diagram
Dinesh Kumar Bhawnani, BIT DURG
MATCH PLAYERplayed
Match_Id
Opponent
Stadium
Date
Score
Summary_Score
Player_Id Player_Name
TEAM
team_played player_of
Name Ranking
Result
Team_Score

18. Question 4
A university registrar’s office maintains data about the following
entities: (a) courses, including number, title, credits, syllabus, and
prerequisites; (b) course offerings, including course number, year,
semester, section number, instructor(s), timings, and classroom; (c)
students, including student-id, name, and program; and (d) instructors,
including identification number, name, department, and title. Further,
the enrollment of students in courses and grades awarded to students
in each course they are enrolled for must be appropriately modeled.
Construct an E-R diagram for the registrar’s office. Document all
assumptions that you make about the mapping constraints.
Dinesh Kumar Bhawnani, BIT DURG

19. Step 1 : Identify the entity sets
• From the given question the entity sets identified are
1. COURSE
2. COURSE-OFFERINGS
3. STUDENT
4. INSTRUCTOR
Dinesh Kumar Bhawnani, BIT DURG

20. Step 2 : Identify the relevant attributes
• The relevant attributes of COURSE entity set are
• Course_No
• C_Tile
• Credits
• Syllabus
• The relevant attributes of COURSE-OFFERINGS entity set are
• Year
• Time
• Secno
• Room
• Semester
• The relevant attributes of STUDENT entity set are
• S_Id
• S_Name
• Program
• The relevant attributes of INSTRUCTOR entity set are
• I_id
• I_Name
• I_Title
• Dept
Dinesh Kumar Bhawnani, BIT DURG

21. Step 3 : Identify the prime attributes
• The prime attribute of COURSE entity set are
• Course_No
• There is no prime attribute in COURSE-OFFERINGS entity set,
so it is an weak entity set, however the partial key
(discriminator) is
• Year
• The prime attribute of STUDENT entity set is
• S_Id
• The prime attribute of INSTRUCTOR entity set is
• I_id
Dinesh Kumar Bhawnani, BIT DURG

22. Step 4 : Identify the relationship
Dinesh Kumar Bhawnani, BIT DURG
COURSErequires
pre-requisite
main-course

23. Step 4 : Identify the relationship
Dinesh Kumar Bhawnani, BIT DURG
COURSE
COURSE-
OFFERINGS
Is_offered

24. Step 4 : Identify the relationship
Dinesh Kumar Bhawnani, BIT DURG
STUDENT enrolls
COURSE-
OFFERINGS

25. Step 4 : Identify the relationship
Dinesh Kumar Bhawnani, BIT DURG
INSTRUCTORteaches
COURSE-
OFFERINGS

26. Step 5 : Complete E R Diagram
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STUDENT INSTRUCTOR
COURSE
enrolls teaches
requires
COURSE-
OFFERINGS
Is_offered
I_id I_Name
Dept I_Title
Course_No
Credits
C_Title
Syllabus
Program
S_Id Grade
S_Name
Time Secno Room
Year Semester
pre-requisite
main-course

27. For Video lecture on this topic please subscribe to my youtube channel.
The link for my youtube channel is
https://www.youtube.com/channel/UCRWGtE76JlTp1iim6aOTRuw?sub
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Dinesh Kumar Bhawnani, BIT DURG