title: how to get results based on column's result type from 2 other tables
body: <p>i have a table called users contained</p>
  
  <pre><code>(Table A) 
  Users
  user_id
  username
  user_type[1,2]
  
  (Table B)     if user_type=1       
  user_id
  full_name
  
  (Table C)     if user_type=2        
  user_id 
  full_name
  </code></pre>
  
  <p>i want to get single record set by executing single query, is that possible in PHP mysql.</p>