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_at_posting.google.com>
Date: 28 Mar 2003 07:39:02 -0800
Message-ID: <4b45d3ad.0303280739.6213c846_at_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 - 16:39:02 CET