title: PostgreSQL round(v numeric, s int)
body: <p>Which <a href="http://en.wikipedia.org/wiki/Rounding#Tie-breaking">method</a> does Postgres <a href="http://www.postgresql.org/docs/9.3/static/functions-math.html"><code>round(v numeric, s int)</code></a> use?</p>
  
  <ol>
  <li>Round half up</li>
  <li>Round half down</li>
  <li>Round half away from zero</li>
  <li>Round half towards zero</li>
  <li>Round half to even</li>
  <li>Round half to odd</li>
  </ol>
  
  <p>I'm looking for documentation reference.</p>