title: Which datatype for flag?
body: <p>Which datatype should I use for a flag (in MySQL)?  I just want to check if a user is online at the moment.<br>
  I thought about a <a href="http://dev.mysql.com/doc/refman/5.5/en/integer-types.html" rel="noreferrer">TINYINT</a> or <a href="http://dev.mysql.com/doc/refman/5.0/en/set.html" rel="noreferrer">SET</a> which both could be 0 or 1.</p>