Null often pops up in legal and scientific contexts; it was originally used in Scottish law and still carries the meaning "having no legal or binding force," especially in the phrase "null and void."

In the SQL database query language, null or NULL is a special marker used to indicate that a data value does not exist in the database.

Feb 16, 2019 · ! is the null-forgiving operator, telling the compiler that, even though it normally wouldn't allow it, it should look the other way and allow it anyway, because we know better. null! itself has little …

Jun 12, 2018 · null is a fundamental concept in many programming languages. It is ubiquitous in all kinds of source code written in these languages. So it is essential to fully grasp the idea of null . We …

Oct 28, 2025 · The null keyword refers to the null primitive value, which represents the intentional absence of any object value.

NULL definition: without value, effect, consequence, or significance. See examples of null used in a sentence.

Sep 7, 2025 · The concept of null and its significance in computing with our comprehensive definition, examples, and explanations. Learn how null differs from zero and empty.

Aug 14, 2024 · Yet, null fills an important role in denoting missing information that is hard to eliminate from language design. Understanding correct and thoughtful usage of null is key to avoiding its pitfalls.

Mar 31, 2024 · Although undefined and null have some functional overlap, they have different purposes. In the strictest sense, null represents a value intentionally defined as "blank," and undefined …

SQL NOT NULL Constraint By default, a column can hold NULL values. The NOT NULL constraint enforces a column to NOT accept NULL values. This enforces a field to always contain a value, …