I have the following query:
SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id FROM dashboard_data INNER JOIN dashboa
Just add another join:
SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id, images.filename FROM dashboard_data INNER JOIN dashboard_messages ON dashboard_message_id = dashboard_messages.id INNER JOIN images ON dashboard_messages.image_id = images.image_id