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If k is a Primary key in a relation R1, then

If k is a Primary key in a relation R1, then

If k is a Primary key in a relation R1, then

(a)Every tuple of R1 has a distinct value for K
(b)K can have a null value for tuples in R1
(c)K must be a key for some other relation
(d)K is a foreign key for R1
(e)K is a Composite key for R1.

Johnson 29-Dec-2017

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