title: Good resources for learning PL/pgSQL?
body: <p>I've been looking around the net trying to find good resources for learning PostgreSQL's procedural programming language, PL/pgSQL.</p>
  
  <p>So far the only thing I've managed to dig up is the <a href="http://www.postgresql.org/docs/8.4/interactive/plpgsql.html" rel="noreferrer">tutorial in the PostgreSQL documentation</a>. While that is good, I've been looking for something more in-depth. Can you recommend anything?</p>