SQL NULL Values - IS NULL and IS NOT NULL - W3Schools
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.
NULL values in SQL - GeeksforGeeks
Jul 23, 2025 · To handle such scenarios, SQL provides a special placeholder value called NULL to represent unknown, unavailable, or inapplicable data. It is essential to understand that a …
The 5 best ways to handle NULL values in SQL | Metaplane
Feb 20, 2025 · There's no one-size-fits-all solution for handling NULL values—it all depends on context and what you're trying to do. With that in mind, here are five ways of working with …
Null vs. Empty Values in SQL Server — Queries and Techniques
Dec 19, 2024 · Learn how to manage null and empty values in SQL Server. Discover various methods, including using IS NULL, COALESCE and ISNULL functions, with practical examples
Working with SQL NULL values
May 19, 2021 · This article will explain what problems can occur when working with SQL NULL values and it also gives some solution recommendations to overcome these issues.
Handling NULL Values in SQL: Best Practices and Common Pitfalls
Jul 24, 2025 · In SQL, NULL means “unknown” or “missing,” and it can make your queries behave in unexpected ways if you’re not careful. In this article, I’ll walk you through what NULL values …
SQL IS NULL and SQL IS NOT NULL Examples - SQL Server Tips
Nov 15, 2024 · This article looks at how to use SQL IS NULL and SQL IS NOT NULL operations in SQL Server along with use cases and working with NULL values.
How to Use Null Values in SQL? A Comprehensive Guide for …
Sep 23, 2023 · Null values might seem like a minor detail in the vast world of SQL, but they often play a crucial role. Let’s dive into some real-world scenarios where null values come into their …
sql - Best way to check for "empty or null value" - Stack Overflow
What is best way to check if value is null or empty string in Postgres sql statements? Value can be long expression so it is preferable that it is written only once in check. Currently I'm using:
SQL ISNULL (), NVL (), IFNULL () and COALESCE () Functions
SQL Server The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: