Re: Oids
From: Vadim Tropashko <vadimtro_invalid_at_yahoo.com>
Date: 17 Aug 2005 14:19:51 -0700
Message-ID: <1124313591.089076.276900_at_g47g2000cwa.googlegroups.com>
Date: 17 Aug 2005 14:19:51 -0700
Message-ID: <1124313591.089076.276900_at_g47g2000cwa.googlegroups.com>
vc wrote:
> According to your own definition, the generalized union is (in terms
> of the standard RA):
>
> 'gu' = union(project( a&b, A), project( a&b, B),
>
> where A and B are relations, a and b are their respective sets of
> attributes, & is the set intersection Applying this definition to
>
> '00' 'gu' A, we obtain either 00 or 01.
What is
project({}, A)
? Received on Wed Aug 17 2005 - 23:19:51 CEST