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Re: Notions of Type

From: Aloha Kakuikanu <aloha.kakuikanu_at_yahoo.com>
Date: 17 Aug 2006 11:51:13 -0700
Message-ID: <1155840673.448704.161470@p79g2000cwp.googlegroups.com> 





David Cressey wrote:


> why can't you say,

>

> PROJECT <relation>, <empty relation>  ->  <relation>




Well, you are just one step away from noticing that



PROJECT <relation> (onto) <empty relation>



is the same as



<relation> UNION <empty relation>
Received on Thu Aug 17 2006 - 13:51:13 CDT












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