title: How to draw two different possibility of query tree for the example? in ddbms
body: <pre><code>select topic 
  from book b, share s, stall st
  where b.b#=s.b#
  and st.store#=s.store#
  </code></pre>
  
  <p>I am trying to draw query tree I dont know how to draw query tree for above example. </p>