Relational Database Concepts and Functions

The video tutorial introduces databases, focusing on relational databases. It explains how tables in relational databases function as flat files and are represented by schemas. Using a business example, the tutorial highlights issues of data redundancy and demonstrates how to create relational tables to address these problems. It further explains the concepts of primary and foreign keys and their roles in linking tables, emphasizing the one-to-many relationship between customers and orders.

What is the primary difference between file and relational databases?

• File databases are more complex than relational databases.

• Relational databases use tables to organize data.

• File databases use tables to organize data.

• Relational databases do not use schemas.

In a relational database, what does a table represent?

• A specific entity and its attributes

• A collection of unrelated data

• A complex data structure

• A single attribute

What problem arises when using a flat file to manage business orders?

• Increased data security

• Faster data processing

• Redundant data and potential errors

• Simplified data management

How does a relational database solve the issue of redundant data?

• By using a single table for all data

• By storing data in a cloud

• By eliminating the need for tables

• By splitting data into related tables

What is a primary key in a relational database?

• A field that can be duplicated

• A field that is not necessary

• A field that uniquely identifies each record

• A field that is always a number

What is the role of a foreign key in a relational database?

• To link tables together

• To store redundant data

• To uniquely identify records in its own table

• To act as a primary key

What type of relationship is described when one customer can have many orders?

• Many-to-one

• One-to-many

• One-to-one

• Many-to-many

In a one-to-many relationship, where is the 'one' side typically placed?

• On neither table

• On the customers table

• On the orders table

• On both tables

Why is it important to use primary and foreign keys in relational databases?

• To establish relationships between tables

• To simplify data entry

• To increase data redundancy

• To ensure data security

What is the main advantage of using relational databases over flat files?

• They are faster to access

• They require less storage space

• They reduce data redundancy and errors

• They are easier to set up