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Re: Merge Data Sets

From: I hate Spam <tbf_at_cn.stam.dk>
Date: Wed, 26 Sep 2001 15:30:53 +0200
Message-ID: <rsl3rtcra8lqcongt5bl5h2kab3949pbjs@4ax.com>


On Wed, 26 Sep 2001 08:48:13 +0100, Andy Johnson
>>
>> these table have no join key and thier is around 25 million
>> rows..
>
>I assume you understand the term cartesian product? If both
>tables have 25 rows, then you will create 25 x 25 = 625 rows.
>Therefore, your cartesian product will create a 625 million row
>table.
>

As i read th message there 25 mill rows in each table. The result would be 625.000.000.000.000 rows. A million times more than 625 million rows.

Yours Hans Erik Busk
tbf_at_cn.stam.dk Received on Wed Sep 26 2001 - 08:30:53 CDT

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