CHAPTER 3: DATA MODELING USING THE ENTITY-RELATIONSHIP (ER) MODEL

4. Windsor Records company has hired you as a database designer. One of your first jobs is to design a conceptual schema for Windsor records and draw an ER diagram for your schema using the following information. The database stores information about musicians who perform on Windsor Records albums as described below.

i. Each Windsor Records musician has a unique social security number (SSN), a name, an address and a phone number.

ii. Each instrument used in recorded songs has a unique name (e.g., guitar, flute, drum, etc.) and a musical key (e.g., C, B-flat, E-flat).

iii. Each album on their label has a unique album identifier, an album title, a copyright date, a format (eg. CD, vinyl, MP3, etc.).

iv. Each song recorded has a unique song title and an author.

v. Each musician may play several instruments, and a given instrument may be played by several musicians.

vi. Each album has a number of songs on it, but no song may appear on more than one album.

vii. Each song is performed by one or more musicians, and a musician may perform a number of songs.

viii. Each album has exactly one musician who acts as its producer. A musician may produce several albums.

Indicate all key and cardinality constraints and any assumptions that you make.

Design the Entity-Relationship (ER) model diagram for this database.

(Total for que 4 is 20 marks) (Note : 10 marks for correct entity and relationship identifications with their attributes in the ER diagram. It is 0 with no ER diagram presented).

(5 for entities and 5 for relationships, 5 marks for correct constraints interpretations on the edge labels, 5 marks for correct verbal interpretations of the database being represented by the ER digram through use of correct symbols etc.).

Hint : Present the conceptual design first, showing (1) all the entities and their attributes, (2) all the relationships and their attributes, (3) all the constraints before drawing your ER.

(Total for que 4 is 20 marks) Conceptual information in table and ER diagram next

Specific Requrieement/Constraint Type	Requirements and Constraints for the ER diagram
Entities and attributes (5 marks) in ER
Relationships and attributes (5 marks) in ER
Interpretation of each of the constraints represented on the edge labels (5 marks) in ER
Correct use of symbols in ER, etc (5 marks)

ER Diagram goes next :

You may attach a scanned copy of your hand-drawn ER diagram here. You can also draw it digitally if possible and attach. Note that in the ER diagram, the foreign key attributes that are part of the relationship schemas are not explicitly listed with the relationship but inherited from the entity the relationships are connected to.

This is the question we are asked to complete and there is no ER given. We have to make a ER ourselves and then finish this question. Thank you.