Mastering COALESCE in SQL: A Beginner’s Guide
The Coalesce SQL function is a powerful tool used to manage NULL values in databases. It returns the first non-NULL expression from a list of given arguments, making queries more reliable and readable. For example, COALESCE(column1, column2, 'Default') ensures that meaningful values are displayed instead of NULLs. This function is especially useful in reports, calculations, and data presentation, where missing values can cause errors or confusion. Since Coalesce SQL is part of the ANSI SQL standard, it works across major databases like MySQL, SQL Server, PostgreSQL, and Oracle, making it essential for effective data handling.
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