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1 . Which of the following sentences is TRUE?a . The proper use of foreign keys is crucial to exercising data redundancy control.b . The
Which of the following sentences is TRUE?a The proper use of foreign keys is crucial to exercising data redundancy control.b The referertial integrity rule requires that every null foreign key value must reference an existing primary key value.c A table can be logically connected to another table by defining a primary key.d It is possible to delete a row in one table whose primary key does not have a matching foreign key value in another
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