Advanced Query Tool uses ODBC drivers to connect to your database. Before you can use AQT with your database, you will need to install and configure both the ODBC Driver and the Database Client. How to do this is described in Configuring a Database Connection.
AQT is reliant on the ODBC drivers to operate correctly; many of the limitations and bugs you see in AQT are because of limitations and bugs in the ODBC drivers.
The following diagram gives a high-level view of the interaction between AQT, the ODBC Driver and the Database Client. Note that for some databases the functionality of the Database Client is part of the ODBC Driver.
The following diagram shows how AQT relates to such technologies as ADO, OLE and JDBC.