Introduction

  • 1 minute

Learning how to filter data effectively is essential for working with databases.
In this tutorial, you explore the WHERE clause in PostgreSQL, a critical component for refining query results. You explore how to apply single and multiple conditions, use operators like IN, NOT IN, AND, OR, and LIKE and work with ranges using BETWEEN. You also learn how to handle NULL values with IS NULL and IS NOT NULL and use subqueries for more advanced filtering.

What will you be doing?

In this tutorial, you explore the fundamentals of filtering data using the WHERE clause in PostgreSQL. You learn how to:

  • Apply single and multiple conditions to refine query results
  • Use logical operators like AND, OR, IN, and NOT IN for complex filtering
  • Work with pattern matching using the LIKE operator
  • Filter data within a range using the BETWEEN operator
  • Handle NULL values effectively with IS NULL and IS NOT NULL
  • Apply subqueries for advanced filtering scenarios

What is the main goal?

By the end of this tutorial, you'll have a solid understanding of how to use the WHERE clause to extract precise and meaningful data from your database.