Database Design for Sports Teams

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Questions and Answers

What is the minimum number of Players a Team can have?

Three

Zero (correct)

Two

One

What type of entity does a Coach represent in the ER model?

Strong entity (correct)

Relationship entity

Weak entity

Aggregate entity

How is the relationship between an entity and another entity represented in the ER model?

Through an attribute relationship

Through a primary key and a foreign key (correct)

Through a recursive relationship

Through an entity relationship

What is the cardinality of the relationship between a Player and a Team?

Many-to-one Signup and view all the answers

What is the purpose of categorizing entities as 'parent' and 'child' entities?

To determine the foreign key attribute Signup and view all the answers

What is the abstraction process in the ER model?

Transforming the conceptual data model to the logical data model Signup and view all the answers

What is the purpose of copying the primary key of an entity in another entity?

To represent a foreign key Signup and view all the answers

In a 1:M relationship, which entity is considered the parent?

The entity with optional participation Signup and view all the answers

What is the characteristic of a weak entity?

It has a copy of the primary key of another entity Signup and view all the answers

In the ER diagram notation, what does the '1' in a 1:M relationship represent?

The entity with one occurrence Signup and view all the answers

What is the purpose of a foreign key in the ER model?

To link two related entities Signup and view all the answers

In the ER model, which type of entity has a mandatory participation in a relationship?

The child entity Signup and view all the answers

What is the relationship between the Department and the Worker entities?

1:1, where the Department is the parent entity Signup and view all the answers

What is the primary key attribute of the Worker entity that is copied into the Department entity?

WorkerNo Signup and view all the answers

Which of the following is a characteristic of the relationship between the Team and the Player entities?

A Team can have multiple Players, but a Player can have only one Team Signup and view all the answers

What is the relationship between the Player and the Parent entities?

1:N, where the Parent is the parent entity Signup and view all the answers

What is the purpose of the ER diagram in the context of the local city youth league?

To design a database system for tracking children's soccer teams Signup and view all the answers

What is the role of the foreign key in the relationship between the Department and the Worker entities?

It is an attribute of the Department entity that identifies the Worker Signup and view all the answers

Study Notes

ER Diagram Concepts

In a 1:1 relationship, the primary key attribute of the parent entity is copied into the child entity as a foreign key.
In a 1:1 relationship, the determination of the parent entity depends on the relationship participation between the entities involved.
The entity with optional relationship participation is categorized as the parent entity, and the entity with mandatory relationship participation is categorized as the child entity.

Relationship Types

1:1 relationship: a copy of the primary key of the parent entity is placed in the child entity as a foreign key.
1:M relationship: a copy of the primary key of the parent entity is placed in the child entity to represent a foreign key.
The entity in "position 1" is the parent entity, and the entity in "many positions" is the child entity.

ER Diagram Example: Worker-Department Relationship

In a 1:1 relationship, the Department must be managed by a Worker.
The primary key attribute of the Worker entity is copied into the Department entity as a foreign key.
The Department has mandatory participation in the relationship Manage.

ER Diagram Example: Youth League Soccer

A Team may or may not have a Player.
A Player must have a Team.
A Team may have many Players.
A Player has only one Team.
A Team may or may not have a Coach.
A Coach must have a Team.
A Team may have many Coaches.
A Coach has only one Team.
A Player must have a Parent.
A Parent must have a Player.
A Player may have many Parents.
A Parent may have many Players.

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Description

Learn how to design a database to manage teams, players, coaches, and parents in a sports organization. Understand the relationships between teams, players, and coaches, and how to define connectivities and participations.