IS NOT NULL is used to identify rows where a specified column does not contain a NULL value. It is useful when an analyst needs to work only with records where required information is available.
Many reports require complete information. Filtering out records with missing values can help analysts create more reliable datasets for analysis and reporting.
A company wants to analyze employees who have a manager assigned. IS NOT NULL can be used to exclude employees whose ManagerID is missing.
SELECT
EmployeeID,
EmployeeName,
ManagerID
FROM Employees
WHERE ManagerID IS NOT NULL;IS NOT NULL is useful for data-quality checks, reporting, customer analysis, financial analysis, and preparing clean datasets.
- IS NOT NULL identifies available values.
- It excludes NULL values from the result.
- IS NOT NULL is useful for data-quality checks.
- It can be used with other WHERE conditions.
- It does not modify the original table.
What does IS NOT NULL do?
IS NOT NULL returns rows where the specified column contains a value rather than NULL.
When would you use IS NOT NULL?
Use IS NOT NULL when you want to work only with records where a particular field contains available information.