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| Q. |
Choose the option that correctly explains in words, the function of the following relational algebra expression σyear≥2009 (book ⋈ borrow) |
| A. | Selects all tuples from the Cartesian product of book and borrow |
| B. | Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009 |
| C. | Selects all the tuples from the natural join of book and student wherever the year is greater than or equal to 2009 |
| D. | Selects all tuples from the Cartesian product of book and borrow wherever the year is greater than or equal to 2009 |
| Answer» B. Selects all the tuples from the natural join of book and borrow wherever the year is lesser than 2009 | |
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