title: How to use Hibernate <subselect>:
body: <p>i am new to hibernate. i need to understand the following questions :</p>
  
  <p>(1) What is subselect in hibernate mapping?</p>
  
  <p>(2) How to map subselect in hbm file?</p>
  
  <p>(3) If i retrieve values using subselect then how to get the retrieved values in java Action class.</p>