table rows

Use the sql paramater to add_db_table and adda where clause:

Something like this:

  $sql =<<<SQL
     SELECT * FROM event_registrations 
     WHERE name='Only This One'
     ORDER BY date_entered DESC
SQL;
  add_db_table_editor(array(
    'title'=>'Event Registrations',
    'table'=>'event_registrations',
    'sql'=> $sql
  ));

You probably should start with the readme file and the examples included in the examples directory

Cheers,