title: Joining two tables where id does not equal
body: <p>I'm struggling getting this query to produce the results I want.</p>
  
  <p>I have: </p>
  
  <p>table1, columns=empid, alt_id</p>
  
  <p>table2, columns=empid, alt_id</p>
  
  <p>I want to get the empid, and alt_id from table 1 where the alt_id does not match the alt_id in table2. They will both have alt_id numbers I just want to get the ones that do not match.</p>
  
  <p>Any ideas?</p>