Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 27 Aug 2017 My Price 4.00

test of Section

Show that the following rules hold, by using the closure test of Section 3.2.4.

a) Augmenting left sides. If A1A2…………An → B is an FD, and C is another attribute, then A1A2…..AnC → B follows.

b) Full augmentation. If A1A2…….An →B is an FD, and C is another attribute, then A1A2 …..AnC → BC follows.

c) Pseudotransitivity. Suppose FD’s A1A2…..An→ B1B2 ……Bm and

holds, where the E ’s are all those of the C ’s that are not found among the B ’s.

d) Addition. If FD’s A1A2……. An→ B1B2 ….. Bm and

Holds In the above, we should remove one copy of any attribute that appears among both the A’s and C’s or among both the B ’s and D ’s.

Answers

Maurice Tutor
(5)
Status NEW Posted 27 Aug 2017 08:08 PM My Price 4.00

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