Practical Cyber Hacking Skills for Beginners - Understanding Databases and SQL

The video tutorial explains the importance of databases in web development, highlighting their role in storing various types of information. It introduces the structure of databases, focusing on tables and their contents. The tutorial then delves into SQL, the standard query language used to interact with databases, providing examples of SQL commands like SELECT and CREATE TABLE. It concludes with advanced SQL queries, demonstrating how to retrieve specific data based on conditions.

What is the primary function of a database in web development?

• To enhance website security

• To store and manage data

• To create animations

• To design the layout of a website

Which of the following is NOT a basic SQL command?

• ANIMATE

• DELETE

• INSERT

• SELECT

What does the SQL command 'SELECT' do?

• It deletes data from a table

• It updates existing data

• It creates a new table

• It retrieves specific data from a database

When creating a table in SQL, what does 'VARCHAR' represent?

• A floating-point number

• A fixed-length string

• A variable-length string

• An integer

In SQL, what is the purpose of the 'NOT NULL' constraint?

• To automatically generate values

• To ensure a column cannot have a null value

• To allow duplicate values

• To restrict data types

What does the 'WHERE' clause in an SQL query do?

• It specifies the table to be used

• It groups the results

• It filters records based on a condition

• It sorts the results

Which SQL command is used to combine conditions in a query?

• UNION

• JOIN

• AND

• OR