Web Reference: Feb 14, 2014 · Unfortunately SQL and SQL-style databases can make nulls difficult, though not necessarily impossible, to avoid. It's a very real problem and even experts often have trouble spotting flaws in query logic caused by nulls. 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 are, share some best practices for handling them, and point out common pitfalls to avoid—all in simple, human terms. Aug 31, 2011 · When a RDBMS allows NULLs for a non-sparse column, that column is added to a bitmap that tracks whether the value is NULL for each individual row. So by adding NULL-ability to a column in a table where all columns do not allow NULLs, you are increasing the storage space required to save the table.
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