Re: Do Data Models Need to built on a Mathematical Concept?

Neo wrote:

>>You need to learn is that a graph is equivalent to a binary relation,
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>A graph is not equivalent to a binary relation.
>A graph is composed of binary relations.
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>>and incidentally the relational model
>>is very well suited for guess what: relations.
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>Draw a hundred dots on a piece of paper and arbitrarily connect lines
>between them until it looks like a hair ball. Give each dot a name.
>Now fit that data in rectangular tables called "relations" and let me
>know if it looks very well suited for this type of application.
>

How about:

create table edges
 (start_x int, start_y int,
  end_x int, end_y int,
   primary key(

     start_x int, start_y int,
     end_x int, end_y int)

insert into edges values( 1,1, 10,10 );
-- meaning that there is a conncetion between points (1,1) and (10,10) insert into (etc...)

Lauri

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Received on Sat May 03 2003 - 07:00:07 CEST