For quick writing SQl queries it analyses code snippets you are writing and offers only appropriate database object names and syntax for their completion.
In order intelligent autocomplete to work, you should be connected to your databases.
SQL tables autocomplete: SQL table´s fields autocomplete:

For every table of database the manager allows to review the structure and change types of fields.

There is very powerful special grid for direct data editing.

You can export all data and base structure or structure of separate table using custom wizard.