If is null sql . If it’s not NULL, the system displays its original value. Comparison operators return UNKNOWN when either or both arguments are NULL. NULL is not Zero. How it works. If the expression is NOT NULL, then the function will return the expression itself. Aug 15, 2014 ยท in SQL Server , how do I verify if a query has returned NULL and run blocks depending on it . For the purpose of demonstration, we will be creating a demo_orders table in a database called “geeks“. Descripción general de la función SQL Server ISNULL La función ISNULL de SQL Server reemplaza NULL con un valor especificado. In this example, we have a table called customers with the following data: W3Schools offers free online tutorials, references and exercises in all the major languages of the web. lmomvrwcbdsschywdwxzmzuyhgxcyllxltkkbjwzxvogoaaulicjpykmdcmphsxqdvatemdxaddx