title: max value from varchar date
body: <p>I need to find max date from a table(mysql database). I am storing my date as varchar.</p>
  
  <p><code>select max(completion_date) from table_name</code> returns wrong value.</p>
  
  <p><a href="http://sqlfiddle.com/#!9/c88f6/3" rel="nofollow">http://sqlfiddle.com/#!9/c88f6/3</a></p>