Re: WWW/Internet 2009: 2nd CFP until 21 September x

From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 17 Aug 2009 13:18:10 GMT
Message-ID: <mMcim.41656$PH1.4336_at_edtnps82>



Walter Mitty wrote:
> "rpost" <rpost_at_pcwin518.campus.tue.nl> wrote in message
> news:h69p4s$2no2$1_at_mud.stack.nl...
>
>> This describes tables with NULLs as shorthands
>> for sets of tables without any NULLs at all,
>> so it introduces in  way that fits perfectly
>> into the relational model.
>>

> You got what I was trying to express. Exactly. Thanks.
>
>

Are you saying that the table

T1:
K C
1 null
2 3

is shorthand for the two tables

T2:
K C
(empty)

and

T3:
K C
2 3

?

If so, how does T1 = T2 JOIN T3? Received on Mon Aug 17 2009 - 08:18:10 CDT

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