MS SQL tutorial on use of ISNULL, ISDATE and ISNUMERIC functions

This is a Microsoft SQL tutorial demonstrating the use of functions ISNULL, ISDATE and ISNUMERIC. ISDATE and ISNUMERIC will evaluate a given value and return 1 or 0 (true or false) if the value is numeric or a date. The ISNULL function will replace NULL values with a chosen replacement value.