Joe Celko's Trees and heirachies in SQL for smarties / 
Celko,Joe 
 - Amsterdam :  Elsevier inc.,  c2012 
 - xiv,277p.:  ill.;  23cm.  it includes bibliographical references and indexes 
<br/><br/><label>ISBN: </label>978 0 12 387733 8 
<br/><br/><label>Subjects--Personal Names: </label>--Computer sceince
<br/><br/><label>Dewey Class. No.: </label>005.133 CEL