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Date: Mon, 23 Apr 2007 08:46:59 +0200
From: "Bart Degryse" <Bart.Degryse@indicator.be>
To: <pgsql-sql@postgresql.org>
Subject: Re: We all are looped on Internet: request +transport =   invariant
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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?


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<DIV>A hierarchical is specialized in managing data which is hierarchically structured, while a relational database is not.</DIV>
<DIV>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.<BR><BR>&gt;&gt;&gt; Dmitry Turin &lt;sql4-en@narod.ru&gt; 2007-04-20 16:21 &gt;&gt;&gt;<BR>&gt;you could use a hierarchical database instead of a relational database<BR><BR>why ?<BR>why is impossible to make addition for relational database?<BR><BR></DIV></BODY></HTML>
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