I have a SQL Server 2008 database that I have linked to an excel file. How can I constantly compare the value of the database to the same value in the excel file? I just need to know when a number changes. For example, lets say I have a product_id, that same product_id is in an excel file that I have my database linked to that someone else maintains and I need to know when that product_id is updated or deleted and send out emails and alert my asp application. I can handle the asp part but I am stumped out the exact query needed to compare an excel worksheet to a table.