Podcast
Questions and Answers
What is the minimum number of Players a Team can have?
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?
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?
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?
What is the cardinality of the relationship between a Player and a Team?
What is the purpose of categorizing entities as 'parent' and 'child' entities?
What is the purpose of categorizing entities as 'parent' and 'child' entities?
What is the abstraction process in the ER model?
What is the abstraction process in the ER model?
What is the purpose of copying the primary key of an entity in another entity?
What is the purpose of copying the primary key of an entity in another entity?
In a 1:M relationship, which entity is considered the parent?
In a 1:M relationship, which entity is considered the parent?
What is the characteristic of a weak entity?
What is the characteristic of a weak entity?
In the ER diagram notation, what does the '1' in a 1:M relationship represent?
In the ER diagram notation, what does the '1' in a 1:M relationship represent?
What is the purpose of a foreign key in the ER model?
What is the purpose of a foreign key in the ER model?
In the ER model, which type of entity has a mandatory participation in a relationship?
In the ER model, which type of entity has a mandatory participation in a relationship?
What is the relationship between the Department and the Worker entities?
What is the relationship between the Department and the Worker entities?
What is the primary key attribute of the Worker entity that is copied into the Department entity?
What is the primary key attribute of the Worker entity that is copied into the Department entity?
Which of the following is a characteristic of the relationship between the Team and the Player entities?
Which of the following is a characteristic of the relationship between the Team and the Player entities?
What is the relationship between the Player and the Parent entities?
What is the relationship between the Player and the Parent entities?
What is the purpose of the ER diagram in the context of the local city youth league?
What is the purpose of the ER diagram in the context of the local city youth league?
What is the role of the foreign key in the relationship between the Department and the Worker entities?
What is the role of the foreign key in the relationship between the Department and the Worker entities?
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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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