S. NO | A | S. NO | B |
1. | Cardinality | [A] | Cannot contain null value. |
2. | Unique key | [B] | Ensures that data in the database is valid and correct. |
3. | Data integrity | [C] | Has eligibility to make 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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