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Which of the following statements concerning the primary key is true? (a) All primary ke

Which of the following statements concerning the primary key is true?
(a)   All primary key entries are unique
(b)   The primary key may be null
(c)   The primary key is not required for all tables
(d)   The primary key data does not have to be unique
(e)   For every primary key there must be a foreign key.

Dec 27 2017 Read more Less More

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