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 …
SQL IS NULL and SQL IS NOT NULL Examples - SQL Server Tips
Nov 15, 2024 · In this SQL tutorial, the goal is to help you better understand how to work with NULL values in a SQL database. This SQL tutorial will provide answers explaining the IS …
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 …
NULL and UNKNOWN (Transact-SQL) - SQL Server | Microsoft Learn
Nov 22, 2024 · 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 …
Mastering NULL Values in SQL: Handling Missing Data with …
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.
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:
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 …
How to Set a Column Value to Null in SQL? - GeeksforGeeks
Jul 23, 2025 · You can set a column value to NULL using the SQL UPDATE statement. Through the UPDATE statement, existing records in a table can be changed. The fundamental syntax …