Database Keys and Relationships

The video tutorial explains how to diagrammatically represent a relational database using a database schema, also known as an entity-relationship diagram (ERD). It covers the basic building blocks of relational databases, including tables and fields, and explains the concepts of primary and foreign keys. The tutorial also discusses the nature of relationships in databases, such as one-to-one and one-to-many, using examples like student, class, and teacher tables. The video concludes with a summary of how to draw a database schema and the importance of understanding entities and relationships.

What is another name for a database schema?

• Entity Relationship Diagram

• Data Flow Diagram

• Process Flow Diagram

• Network Diagram

In a relational database, what are the basic building blocks?

• Files and Folders

• Classes and Objects

• Tables and Fields

• Graphs and Nodes

What is a primary key?

• A key that is not used in relationships

• A unique identifier for each record in a table

• A key that can be duplicated

• A key that links to another table

What type of key is used to link tables together?

• Candidate Key

• Primary Key

• Composite Key

• Foreign Key

In a primary school, what type of relationship exists between a student and a class?

• Many-to-One

• Many-to-Many

• One-to-Many

• One-to-One

How many classes does a teacher typically teach in a primary school?

• One

• Two

• Three

• Four

What is the relationship between a teacher and a class in a primary school?

• One-to-One

• Many-to-Many

• One-to-Many

• Many-to-One

What is a common method for creating unique teacher IDs in a school?

• Using favorite colors

• Using three-letter codes from names

• Using birth dates

• Using random numbers

What is the main purpose of a database schema?

• To store data

• To visually represent the structure of a database

• To execute queries

• To manage user access

What does an entity relationship diagram primarily consist of?

• Tables and Queries

• Entities and Relationships

• Attributes and Keys

• Entities and Attributes