Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 14 Sep 2017 My Price 4.00

proposed decOlnposition

Exercise 19.10  Suppose  you  are  given  a  relation  R(A,B, C,D).  For  each  of  the  following sets of FDs, assuming they are the only dependencies that hold for R, do the following: (a) Identify  the  candidate  key(s)  for  R.   (b)  State  whether  or  not  the  proposed  decOlnposition  of R  into  smaller  relations  is  a  good  decolllposition  and  explain  why  or  why not.

 

1.

B

 D

A;  decornpose  into  BC and AD.

2.

AB

C,  C

A,  C       D;  decompose  into  A CD and Be.

 

4.

A

A

BC,  C

B,  B

AD;  decornpose  into  ABC and AD.

C,  C      D;  decornpose  into  AB  and  A CD.

5.

A

B,  B

C,  C      D;  decOInpose  into  AB,  AD  and  CD.

Answers

Maurice Tutor
(5)
Status NEW Posted 14 Sep 2017 12:09 PM My Price 4.00

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