title: PostgreSQL: Why are quotation marks required in queries when referring to tables and attributes?
body: <p>I've been learning SQL and haven't been taught to use double quotation marks around table and attribute references in a query, yet I'm using PostgreSQL and it seems to demand this.</p>
  
  <p>It says the relation doesn't exist otherwise when I try to execute a query.</p>
  
  <p>Why is this? Is there a way to change it? I'm using version 9.4.</p>