GRUBER, Martin <br/><br/>
Understanding SQL 

 - New Delhi  BPB   1995 
 - xxvi, 483p. 
<br/><br/><label>ISBN: </label>81-7029-644-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Using The Exists Operator<br/>Correlated Subqueries<br/>Using the Union Clause
<br/><br/><label>Dewey Class. No.: </label>006.663