SQL Server COALESCE() Function

Return the first non-null value in a list:

SELECT COALESCE(NULL, NULL, NULL, 'W3Schools.com', NULL, 'Example.com');

Definition and Usage

The COALESCE() function returns the first non-null value in a list.

COALESCE(val1, val2, ...., val_n)

Parameter	Description
val1, val2, val_n	Required. The values to test

Works in:	SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Return the first non-null value in a list:

SELECT COALESCE(NULL, 1, 2, 'W3Schools.com');