title: SQL Developer "disconnected from the rest of the join graph"
body: <p>I have the following SQL:</p>
  
  <pre><code>select &lt;misc things&gt;
  from pluspbillline 
  left outer join workorder 
      on workorder.siteid=pluspbillline.siteid 
      and workorder.wonum = pluspbillline.refwo
      and workorder.orgid = pluspbillline.orgid
  left outer join ticket
      on ticket.ticketid = pluspbillline.ticketid
      and ticket.class=pluspbillline.ticketclass
  left outer join pluspsalesorder
      on pluspsalesorder.salesordernum=pluspbillline.salesordernum
      and pluspsalesorder.siteid=pluspbillline.siteid
  </code></pre>
  
  <p>In Oracle SQL Developer 4.0.0.13 (connected to a DB2 database), I get a squiggly line underneath the following italics: "from <em>pluspbillline</em>" and "left outer join <em>workorder</em>".</p>
  
  <p>The warning says "pluspbillline is disconnected from the rest of the join graph". What does this mean?</p>