title: MySQL grouping and assembling
body: <p>I'm trying to create something as the following:</p>
  <p>1-I need to have top level item, mid level item, low level item.</p>
  <p>2-A mid level item can consists of low level items, or is simply a stand alone item</p>
  <p>3-a top level item consists of mid level items.</p>
  <p>For example:</p>
  <p>Top level item:
  1- Mid level item1.
  2- Mid level item2.
  3- Mid level item3:
  1- low level item1.
  2- low level item2.
  4- Mid level item 4.</p>
  <p>Any help on how to create data bases that are connected in such way using mysql or is there a better db to use than mysql for this kind of needs?</p>
  <p>Thanks.</p>