title: How to find Nth percentile with SQLite?
body: <p>I'll like to find Nth <a href="http://en.wikipedia.org/wiki/Percentile" rel="noreferrer">percentile</a>.</p>
  
  <p>for example: table: htwt; columns: name, gender, height, weight</p>
  
  <p>result:</p>
  
  <pre><code>| gender | 90% height | 90% weight |
  | male   |        190 |         90 |
  | female |        180 |         80 |
  </code></pre>