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Which of the following data integrity statements will NOT be included in the descriptors in referential integrity?
Every foreign key in the secondary table will match a key in the parent table
Every row has a unique secondary code
Every tuple has unique primary key which is not null
Every attribute value is consistent with the natural data type
While a relation usually has a primary key, it is not a requirement for normalization. However a foreign key must reference a key in another table.
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