The database navigator displays catalogs, schemas, tables and columns of a database in a tree format. This allows you to see the hierarchical structure of the database. If there is only one item in a tree, that item will be collasped to minimize the number of clicks needed to reach a node. With a collaspe, the name of both nodes combined with a period. There are two features of the database navigator that are important: Regex Filter and Query Builder.
The databse navigator allows you to input a regular expression to filter the tree. Each node has a full path expression that represent the path of the node from the root to itself. So the path for the table "pn_phpbb_user_group" is "phoenix.pn_phpbb_user_group".
A nice feature with regular expression is that the "or" operator can be used. For information about regular expression go to http://java.sun.com/docs/books/tutorial/essential/regex/
On each table node there are options to generate SQL statements with the query builder. Right clicking on the node will bring four types of query builders: select, update, insert, and delete. Double clicking on a table node will run "SELECT * FROM <table selected>".