Web Reference: Operations involving NULL values can sometimes lead to unexpected results. SQL has some built-in functions to handle NULL values, and the most common functions are: COALESCE() - The preferred standard. (Works in MySQL, SQL Server and Oracle) IFNULL() - (MySQL) ISNULL() - (SQL Server) NVL() - (Oracle) IsNull() - (MS Access) Jul 24, 2025 · In this article, I’ll walk you through what NULL values are, share some best practices for handling them, and point out common pitfalls to avoid—all in simple, human terms. 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 that should solve almost all of your use cases with ease.
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