Using a combination of PHP and MySQL functions, you can query an online database for numerical values, add them together and display the results on your Web page.

How to Use PHP for MySQL to XML. An XML file displays rows and columns you retrieve from a MySQL database. Using PHP, you can export data from a database table to a Web form.

LibreOffice contains a very powerful database tool that is actually quite user friendly. Here's how to create a database query using the Design View tool.