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 · In SQL, some records in a table may not have values for every field, and such fields are termed as NULL values. These occur when data is unavailable during entry or when the attribute …
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 values in …
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.
Working with SQL NULL values
May 19, 2021 · What is a SQL NULL value? In terms of the relational database model, a NULL value indicates an unknown value. If we widen this theoretical explanation, the NULL value points to an …
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 are, …
NULL and UNKNOWN (Transact-SQL) - SQL Server | Microsoft Learn
Nov 18, 2025 · Null values generally indicate data that is unknown, not applicable, or to be added later. For example, a customer's middle initial might not be known at the time the customer places an …
Mastering NULL Values in SQL: Handling Missing Data with Confidence
In this blog, we’ll explore what NULL values are, why they matter, how to work with them in SQL, and best practices to ensure your queries handle missing data effectively.
Null vs. Empty Values in SQL Server — Queries and Techniques
Dec 19, 2024 · In databases, NULL values and blank strings differ in definition, syntax, and length, and they are treated differently in query and data manipulation. Therefore, detecting NULL and empty …
Find Null or Empty Values in SQL Baeldung on SQL
Jun 6, 2024 · Before starting to write the SQL query, it’s essential to understand the distinctions between NULL and empty values (strings). NULL values in SQL represent missing or unknown data in a …