A table T1 in a relation database has following rows and columns.
Roll number Marks.
1 10
2 20
3 30
4 NULL
The following sequence of SQL statements was successfully executed in table T1.
Update T1 set marks =marks + 5 ;
select avg(marks) from T1 ;
What is the output of the select statement?
| A. | 18.75 |
| B. | 20 |
| C. | 25 |
| D. | NULL |
Answer : A Explanation : Average = (15+25+35+null)/4 = 18.75 kiran said: (3:45pm on Sunday 12th May 2013)
5 in each marks then calculate and find its average
mubina said: (3:44pm on Thursday 27th June 2013)
null is updated but the average calculated on (15 25 35)/3 so it wwill give output 25
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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. |
