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The entity integrity rule requires that (a) All primary key entries are not unique (b)

The entity integrity rule requires that
(a)   All primary key entries are not unique
(b)   A part of the key may be null
(c)   Foreign key values do not reference primary key values
(d)   Duplicate object values are allowed
(e)   All primary key entries are unique.

Dec 27 2017 Read more Less More

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