title: find the youngest student from date
body: <p>I have the below table:</p>
  
  <pre>
  <strong>name      id     DOB                        marks</strong>
  rk         2     2006-02-03 00:00:00.000    30
  mk         3     2006-07-07 00:00:00.000    30
  pk         4     2006-04-09 00:00:00.000    30
  sk         5     2006-05-03 00:00:00.000    30
  fk         6     2006-08-09 00:00:00.000    30
  nk         7     2007-08-06 00:00:00.000    30</pre>
  
  <p>How can I find the youngest student? </p>