Hey all

I have a MySQL Database with a coupe of rows and a page setup to display the data in mysql. To do so, I go to www.site.com/example.php?id=2 and it iwll bring me the row 2 of data from the database.

However, is it possible if someone enters www.site.com/example.php?id=100, it will bring out an error message if there is no id 100?