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 · A NULL value represents missing or undefined data. Since it is often not possible to determine which interpretation applies, SQL treats all NULL values as distinct and does not …
SQL NULL Meaning and How to Handle NULL Values
Jun 20, 2024 · Variables hold the value NULL when declared and before being set to any value. In this case, NULL, again, indicates the absence of any value. It is important to understand that …
SQL NULL Values Explained with Examples - DbSchema
Aug 22, 2023 · In SQL, NULL is a special marker used to indicate that a data value does not exist in the database. It is important to note that NULL is not the same as an empty string or a zero …
Understanding NULL in SQL: What It Means (And Doesn’t)
Jul 11, 2025 · What Is NULL in SQL Server? In SQL, NULL means that a value is missing or unknown. It is not the same as zero, an empty string, or a blank space. It simply means that no …
What is Null? – A Concise Explanation of Its Meaning and Concept
Mar 16, 2025 · In the realms of programming and computer science, Null signifies a state of “nothingness” or an absence of data. Null indicates a state where nothing exists or no valid …
Mastering NULL Values in SQL: Handling Missing Data with …
In SQL, a NULL value represents missing, unknown, or inapplicable data in a column. It’s not the same as zero, an empty string (''), or any other value—it’s a special marker indicating the …
Understanding Null in SQL: A Beginner's Guide - Newtum
Feb 24, 2025 · In SQL, NULL represents missing or unknown data and is not the same as zero or an empty string. It signifies the absence of a value in a database column. Since NULL is not a …
SQL - NULL Values - Online Tutorials Library
SQL uses the term NULL to represent a non-existent data value in the database. These values are not the same as an empty string or a zero. They don't hold any space in the database and …
What is a Database NULL Value? - Essential SQL
Sep 5, 2014 · A null value is used in databases to signify a missing or unknown value. A NULL can be tricky. NULL = NULL is false!