title: SQL Error: ORA-00913: too many values 00913. 00000 - "too many values"
body: <pre><code>select * from crew cr 
  where cr.crew_supervisor_id in
  (select *
  from crew c
  where not exists
  (select crew_supervisor_id
  from crew cr
  where c.crew_id = cr.crew_supervisor_id))
  order by crew_id;
  </code></pre>
  
  <p>so I'm trying to extract information out of a table i made, and sql developer keeps popping up this error, can anyone help me?? thanks a lot</p>