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

From: paul c <toledobythesea_at_oohay.ac>
Date: Fri, 14 Aug 2009 13:42:14 GMT
Message-ID: <WQdhm.41209$PH1.17717_at_edtnps82>



Mr. Scott wrote:
> ...
>> 1) in SQL, just what does decompositon of tables mean?  Does it mean what 
>> relational decomposition means, ie., lossless  projection, or something 
>> else?

>
> Relational decomposition doesn't mean lossless projection. The decomposed
> relations can contain extra tuples that don't show up in a join.
> Referential constraints are needed to prevent the extra tuples.
> ,,,

What is the difference between 'relational decomposition' and mere projection? Received on Fri Aug 14 2009 - 08:42:14 CDT

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