title: Check to see if an ID exists in a database
body: <p>When given an <code>ID</code> number, I want to check to see if it exists in the database. Return <code>true</code> if the <code>ID</code> is found and if not, then return <code>false</code>.</p>
  
  <p>My knowledge of MySQL is very low, but I am assuming it would be something to do with the <code>COUNT(*)</code> function possibly? </p>