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Re: Expressing SQL in relational algebra

From: Neo <neo55592_at_hotmail.com>
Date: 28 Mar 2003 07:39:02 -0800
Message-ID: <4b45d3ad.0303280739.6213c846@posting.google.com> 





How can I express "John likes Mary" using relational algrebra using
only "John", "likes", "Mary", intersection operator(^) and grouping
operators ("()")? The expression should not find "Mary likes John",
"like John Mary", etc. Would the following expression be correct:
(((John ^ John) ^ likes) ^ Mary)
Received on Fri Mar 28 2003 - 09:39:02 CST












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