Moving Exchange mailboxes from one database to another is sometimes required to reduce the size of database, for migration, and other purposes.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

What you'll need: To create a database, you'll need LibreOffice installed on your platform of choice (Linux, MacOS, or Windows) and an idea of how you want to design your database.