title: What is the order of records in a table with a composite primary key
body: <p>In PostgreSQL, when a combination of multiple columns is specified as the <code>PRIMARY KEY</code>, how are the records ordered?</p>
  
  <p>This is with the assumption that PostgreSQL orders the records in the order of the primary key. Does it?</p>
  
  <p>Also, is the primary key automatically indexed in case of PostgreSQL?</p>