Question: Which if the following is entity integrity? a. Primary key cannot be null (empty) b. Primary and foreign key must be the same c. Entity
Which if the following is entity integrity?
| a. | Primary key cannot be null (empty) | |
| b. | Primary and foreign key must be the same | |
| c. | Entity key cannot be null (empty) | |
| d. | Foreign key cannot be null (empty) |
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