Discuss the characteristics of relations that make them different from ordinary tables and files

1 answer:

5 0

Ordering of tuples in a Relation : The tuples are not considered to be in order, even though they appear to be in the tabular form. The Ordering of attributes in a relation schema R and of values within each tuples - We consider the attributes in R(A1, A2, .., An) and the values in t=<v1, v2, .., vn> to be in order. Values in a tuple : All values are considered to be indivisible (atomic). A special null value is used to represent values that are unknown or not applicable to certain tuples.

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Explanation:

Let P(at least one is more careful about personal information when using a public Wi-Fi hotspot) denote the probability that among three randomly selected Internet users, at least one is more careful about personal information when using a public Wi-Fi hotspot, then we have the equation

P(at least one is more careful about personal information when using a public Wi-Fi hotspot) = 1 - P(none of the selected users is more careful about personal information when using a public Wi-Fi hotspot)

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