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

From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 17 Aug 2009 13:22:57 GMT
Message-ID: <RQcim.41657$PH1.8769_at_edtnps82>



paul c wrote:
> 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?

Or do you mean that the table

T1:
K C
1 null
2 3

is shorthand for the two tables

T2:
K
1

and

T3:
K C
2 3

?

If that's what you mean, I still need to ask how T1 = T2 JOIN T3? Received on Mon Aug 17 2009 - 08:22:57 CDT

Original text of this message