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Database Systems - Section 2 Multiple Questions and Answers.
| 11. | Which of the following is a fundamental operation in relational algebra? | ||
| A. | Set intersection | ||
| B. | Natural join | ||
| C. | Assignment | ||
| D. | None of the mentioned | ||
| 12. | PredictiveIn a natural join if the two are equivalent in an expression, is said to be? | ||
| A. | Definitive | ||
| B. | Predictive | ||
| C. | Associative | ||
| D. | Assignment | ||
| 13. | PredictiveIn a natural join if the two are equivalent in an expression, is said to be? | ||
| A. | Definitive | ||
| B. | Predictive | ||
| C. | Associative | ||
| D. | Assignment | ||
| 14. | The predicate of a selection statement may include comparisons between: | ||
| A. | Two attributes | ||
| B. | Multiple attributes | ||
| C. | Two relations | ||
| D. | Multiple relations | ||
| 15. | In the relational algebra, the select, project, and rename operations are known as: | ||
| A. | Dimensional operations | ||
| B. | Multidimensional operations | ||
| C. | Unary operations | ||
| D. | Binary operations | ||
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