Question 23: This question has two parts; be sure to answer...

Question 23: This question has two parts; be sure to answer both. 23a): Explain the meaning of Logical Independence for Relational Database. In your explanation, be sure also to provide a clear example that illustrates Logical Independence. Answer 23a):

Transcript

00:01 In this question we have to find the smallest set of independence or conditional independence relationship for the given following problems.

00:10 So the first that we have given to us is probability a intersection b is equal to probability of event a given that b is already occurred multiplied with probability of b.

00:26 So here probability of a given that b is already occurred denotes occurrence of a when b is already occurred.

00:52 So it implies a depends on b.

01:03 So here b is the independent set because a is a is.

01:09 Is dependent on the b.

01:11 So the smallest set of independence for this question is b is the independent set.

01:25 So this is answer to the sub question 1.

01:29 Now in second question we have given probability of a intersection b is equals to probability of a multiplied with probability of b.

01:42 So this we can write when a and b both are independent.

01:57 So here if a is independent of b then probability of event a given that b is already occurred is equal to probability of a.

02:18 So probability of a is equal to probability of a times probability of b.

02:27 Now if similarly b is independent of a, then we have probability of event b given that a is already occurred as equal to probability of b.

02:48 So from these two cases we can observe that the independent set the independent set for this is a comma b.

03:07 So this is answer to the second sub part...

Question

Question 23: This question has two parts; be sure to answer both. 23a): Explain the meaning of Logical Independence for Relational Database. In your explanation, be sure also to provide a clear example that illustrates Logical Independence. Answer 23a):

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