need some help

From: <jimi_xyz_at_hotmail.com>
Date: 24 Feb 2005 01:13:54 -0800
Message-ID: <1109236434.570653.135180_at_g14g2000cwa.googlegroups.com>



Hi, I need some help with this database question..

suppose s(R) = {A, B, C, D}
and suppose FDs
A,B->C; C->D; D->A

A)What are the keys?
B)What are the superkeys that are not keys?

Thanks any info will help,
Jimi Received on Thu Feb 24 2005 - 10:13:54 CET

Original text of this message