This feature contains the new database framework. This framework
allows you to connect to any JDBC compliant database, to visually
assemble database queries and to manipulate the data within the
database.
Extension 
KNIME Database
Included nodes & related workflows
Legal
Copyright by KNIME AG, Zurich, Switzerland
Update site information
KNIME Analytics Platform 4.3 Update Site, Version 4.3.0
http://update.knime.com/analytics-platform/4.3
In case you can’t install the extension via drag & drop, please check that the update site is activated.