1. | Cardinality | A. | Can not contain null value. |
2. | Unique key | B. | Ensures that data in the database is valid and correct. |
3. | Data integrity | C. | Has eligibility to made primary key. |
4. | Candidate key | D. | The number of tuples in a relation. |
E. | Can contain null value. |
A) 1\[\to \]D, 2\[\to \]E, 3\[\to \]B, 4\[\to \]C
B) 1\[\to \]D, 2\[\to \]E, 3\[\to \]A, 4\[\to \]B
C) 1\[\to \]B, 2\[\to \]C, 3\[\to \]D, 4\[\to \]E
D) 1\[\to \]C, 2\[\to \]E, 3 \[\to \]B, 4\[\to \]B
E) None of these
Correct Answer: A
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