I'm pretty sure this DB only has data about users who received or sent at least one merit (since the data is probably taken from theymos' weekly merit history file). If there is no merit transaction coming from your account, you can't be in that database.
So, 30858 accounts have received/sent merit at least once.
This is a tool that
allow you to run full SQL queries over the merit data and is based on
SQLite. If you are familiar with SQL you know the possibilities are basically endless or limited to your SQL knowledge.