title: Get month name from number in PostgreSQL
body: <p>I have a table with a column <code>month</code>(<code>integer</code>). In this column I store values like <code>1, 2, .. 12</code>.<br>
  But I have to show the month <em>name</em>.</p>
  
  <p>Ex:
  If the value is <code>1</code> I need to display <code>jan</code>.</p>