Master SQL for Data Analysis - Filtering Conditions (WHERE) – Part 1

The video tutorial covers the importance of filtering data in QL, emphasizing the use of smart queries to optimize database performance. It explains how to create filters using the WHERE keyword and various operators, providing examples of filtering on single conditions and non-matching values. The tutorial also discusses filtering ranges with the BETWEEN operator and handling NULL values using IS NULL and IS NOT NULL keywords. The session concludes with a brief overview of the next lecture, which will explore more complex filtering conditions.

What is the importance of applying optimized filters while building queries?

Explain how the 'WHERE' keyword is used in query language.

Describe the use of the 'BETWEEN' operator in filtering data.

What does a NULL value indicate in a database?

How can you filter out NULL values in a query?