A set of attributes forms a 2-tuples in a relation instance to have the same values...
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A set of attributes forms a 2-tuples in a relation instance to have the same values in all that attributes for a relation if we do not allow А. Кey B. Foreign Key C. Trigger Key D. Index Key A set of attributes forms a 2-tuples in a relation instance to have the same values in all that attributes for a relation if we do not allow А. Кey B. Foreign Key C. Trigger Key D. Index Key
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