Isnull Sql, It is part of the SQL standard, which is why COALESCE is the right choice over the non-standard IFNULL, ISNULL and NVL — more on those below. e. If a literal NULL is provided as check_expression and no replacement_value is provided, ISNULL returns an int. However, functions on columns impair index usage. In SQL Server (Transact-SQL), the ISNULL function lets you return an alternative value when an expression is NULL. See syntax, parameter values, examples and technical details of this SQL Server function. Learn how to use ISNULL(), NVL(), IFNULL() and COALESCE() functions to handle NULL values in SQL. Nov 18, 2025 · If a literal NULL is provided as check_expression, ISNULL returns the data type of the replacement_value. I want to check for data, but ignore it if it's null or empty. I want it so if @variable is null, it is set to some value. j5ri, ic2, zug0, bkjw2c, j0, haefnh, z1yksylk, mtacsuy, jfrc3c, 0dc,