This course shows three types of Rational Databases from inside. It starts with an overview of the history and usage of the databases; then we build the real database in MS Access and reproduce the same database in MySQL and MS SQL Server. After this course, the user will be able not only to create the database but also build the form and report in MS Access. You will see how web applications use databases, where to find the documentation, and how to use it. I will show you some development and production databases and how different systems store passwords.