Beginner

83. IS NOT NULL

Learn how to find rows where a column contains a value using IS NOT NULL.

📘 Lesson 83 of 728 ⏱ 7 min 🎯 Beginner

The IS NOT NULL operator checks whether a column contains a non-NULL value. It is used when you want to return records where required information is available.

Filtering out incomplete records is a common requirement in data analysis and reporting.

An analyst may want to find employees who have a manager assigned. IS NOT NULL can filter out employees whose ManagerID is missing.

SQL 
SELECT
    EmployeeName,
    ManagerID
FROM Employees
WHERE ManagerID IS NOT NULL;

IS NOT NULL is useful for data validation, customer analysis, employee reporting, transaction analysis, and preparing clean datasets.

  • IS NOT NULL checks for available values.
  • It excludes NULL values.
  • It is useful for data-quality analysis.
  • It can be combined with other conditions.
  • It is commonly used before analytical processing.
What does IS NOT NULL do?

It returns rows where the specified column contains a non-NULL value.

When would you use IS NOT NULL?

You use it when you need records where a particular field contains available information.

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