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Question 2 8 ( 1 point ) The referential integrity rule requires that Every null foreign key value must reference an existing primary key value.
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The referential integrity rule requires that
Every null foreign key value must reference an existing primary key value.
An attribute has a corresponding value.
A row cannot be deleted in one table whose primary key does not have a matching foreign key value in another table.
Every nonnull foreign key value references an existing primary key value.
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