=== on 19 Mar 2014, 14:15:59 Dinesh Bolkensteyn wrote:
Here are some nice explanations:

  \http://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:953229842074

  \http://asktom.oracle.com/pls/asktom/f?p=100:11:0::NO::P11_QUESTION_ID:442029737684