A hierarchical is specialized in managing data which is hierarchically structured, while a relational database is not.
Maybe this analogy is clearer: If you want to fly you could attach wings to your sportscar, but it's more logical to use a plane.
>>> Dmitry Turin <sql4-en@narod.ru> 2007-04-20 16:21 >>>
>you could use a hierarchical database instead of a relational database
why ?
why is impossible to make addition for relational database?
