Master SQL for Data Analysis - Virtual Tables (Views)

The video tutorial explains SQL views, which are virtual tables that allow users to query data from one or multiple tables without replicating the data. Views simplify complex SQL queries and can restrict access to sensitive data. The tutorial demonstrates how to create views, such as a view for user data and another for consolidating book data from two tables. It highlights the benefits of using views, including query simplification and data security, and explains how views can be modified or removed.

What is a primary purpose of using a view in SQL?

• To replace the need for tables

• To store data permanently

• To simplify complex SQL queries

• To increase data redundancy

How does a view differ from a table in SQL?

• A view requires more storage space

• A view can only access one table

• A view is a stored query without actual data

• A view stores data permanently

What is the first step in creating a view in SQL?

• Delete existing tables

• Create a new table

• Write a complex SQL query

• Assign a name to a select statement

Why might you choose to create a view over a complex query?

• To avoid typing the query repeatedly

• To increase the complexity of the database

• To store data permanently

• To reduce the number of tables

What is a benefit of using views for database designers?

• They can increase the number of tables

• They can store data more efficiently

• They can eliminate the need for SQL queries

• They can change base tables without affecting users' queries

How can views help in managing sensitive data?

• By storing sensitive data separately

• By excluding sensitive columns from the view

• By encrypting the data

• By deleting sensitive data

What is the command to remove a view in SQL?

• DELETE VIEW

• REMOVE VIEW

• DROP VIEW

• ERASE VIEW