The result of the UNION operation between R1 and R2 is a relation that includes
| A. | All the tuples of R1 |
| B. | All the tuples of R2 |
| C. | All the tuples of R1 and R2 |
| D. | All the tuples of R1 and R2 which have common columns |
Answer : C Explanation : shekhar said: (6:26pm on Thursday 15th August 2013)
option D is correct because UNION result depend on condition that both relation should have comman field or common column to generate result.
shekhar said: (6:26pm on Thursday 15th August 2013)
option D is correct because UNION result depend on condition that both relation should have comman field or common column to generate result.
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
