This video tutorial explains the concept of indexes in SQL, highlighting their role in speeding up data retrieval from databases. It provides a step-by-step guide on creating indexes using the 'create index' statement, including examples with single and multiple columns. The tutorial also covers how to delete an index using the 'drop index' statement. Key points include the invisibility of indexes to users and their importance in optimizing query performance.

What is the primary purpose of using indexes in SQL?

• To simplify database design

• To increase the storage capacity of the database

• To speed up data retrieval

• To enhance data security

Which SQL command is used to create an index?

• CREATE TABLE

• CREATE INDEX

• CREATE VIEW

• CREATE DATABASE

When creating an index, where do you specify the column names?

• Inside the SELECT statement

• Within the WHERE clause

• In the FROM clause

• Inside brackets after the table name

How can you delete an index in SQL?

• Using the DELETE INDEX command

• Using the REMOVE INDEX command

• Using the CLEAR INDEX command

• Using the DROP INDEX command

When is it beneficial to create an index on a column?

• When the column has a small range of values

• When the column is rarely used in queries

• When the column contains a wide range of values

• When the column is a primary key