SQL COALESCE Function: Managing NULL Values With Ease
SQL COALESCE handles NULL values by returning first non-NULL value among specified columns or expressions, ensuring consistent output & avoiding errors in calculations & sorting.
The SQL COALESCE function provides a practical solution for managing NULL values in database operations. NULL values, representing unknown or missing data, can cause issues if not handled correctly, leading to errors in calculations and inconsistencies in sorting. COALESCE allows you to set fallback values directly in your queries, returning the first non-NULL value among the specified columns or expressions. This guide provides simple examples to illustrate how COALESCE can be used across different DBMS platforms like MySQL, PostgreSQL, and SQL Server. SQL COALESCE examples...