If you are looking for practical information about accessing the database it has been moved to the Joomla! 1.5 page linked below
The table below outlines the database and storage connectors available for Joomla! as well as which version of Joomla they became available in.
To make a connector available in Joomla's installer or global configuration manager, you will need to ensure the PHP library is installed (E.g. for PHP5 and MySQL the php5-mysql library would need to be installed).
|Microsoft SQL Server|
|Microsoft SQL Azure|
|PHP Data Objects (PDO)*|