Which of the following is true?
I. Implementation of self-join is possible in SQL with table alias.
II. Outer-join operation is basic operation in relational algebra.
III. Natural join and outer join operations are equivalent.
| A. | I and II are correct. |
| B. | II and III are correct. |
| C. | Only III is correct. |
| D. | Only I is correct. |
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Option: D Explanation : Click on Discuss to view users comments. |
_______ are applied throughout the software process.
| A. | Framework activities |
| B. | Umbrella activities |
| C. | Planning activities |
| D. | Construction activities |
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Option: B Explanation : Click on Discuss to view users comments. |
The period of a signal is 10 ms. What is its frequency in Hertz?
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10000 |
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Option: B Explanation :
1m sec= 1000 hertz
period = 10ms
frequency=1/period=1/10 * 1000
=100
correct answer B
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If we define the functions f, g and h that map R into R by :
f(x) = x4, g(x) = √x2 + 1, h(x) = x2 + 72, then the value of the composite functions ho(gof) and (hog)of are given as
| A. | x8 - 71 and x8 - 71 |
| B. | x8 - 73 and x8 - 73 |
| C. | x8 + 71 and x8 + 71 |
| D. | x8 + 73 and x8 + 73 |
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Option: D Explanation : Ho(go(f()) is Ho(G(x4))=Ho(sqrt(X4+1)) =Ho(x4+1)=x8+1+72 = x8+73 hence answer would be D Click on Discuss to view users comments. Muthu Mariyappan said: (5:08pm on Monday 29th December 2014)
d
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