A table T1 in a relational database has the following rows and columns:
| roll no. | marks |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | Null |
The following sequence of SQL statements was successfully executed on 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: (C)
Explanation: 10+5
20+5
30+5
NULL+5=NULL
(15+25+35)/3=25
So Answer is C
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