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.

Jan 5, 2026 · Some records in an SQL table may not have values for every field, and such fields are termed NULL values. These occur when data is unavailable during entry or when an …

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.

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 …

Null (SQL) The Greek lowercase omega (ω) character is used to represent Null in database theory. In the SQL database query language, null or NULL is a special marker used to indicate …

Jun 6, 2024 · In SQL, NULL represents missing or unknown data, covering cases where data is absent or uncertain. We can use empty strings for similar purposes, allowing us to differentiate …

To fetch the NULL values from a table, we can use keywords, NULL or NOT NULL. You can not select NULL data of a table by using any comparison operators (e.g. =, !=, >, < ).

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 …

Jun 4, 2025 · In this article, we’ll explore how NULLs behave in SQL, best practices to handle them properly, common pitfalls to avoid, and real-world use cases that highlight their impact.

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.