---
title: "What is NOT NULL Constraint?"  
description: "What is NOT NULL Constraint?"  
author: "Sumit Kesarwani"  
published: 2014-03-15  
updated: 2020-09-17  
canonical: https://www.mindstick.com/interview/1933/what-is-not-null-constraint  
category: "mssql server"  
tags: ["mssql server"]  
reading_time: 1 minute  

---

# What is NOT NULL Constraint?

A NOT NULL constraint enforces that the column will not accept null values. The not null constraints are used to enforce domain integrity, as the check constraints.

## Answers

### Answer by Sumit Kesarwani

A NOT NULL constraint enforces that the column will not accept null values. The not null constraints are used to enforce domain integrity, as the check constraints.


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Original Source: https://www.mindstick.com/interview/1933/what-is-not-null-constraint

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