Reverse words in a string. vague question with no example given. ex- this is a question. output- question is a this.

what is boxing and unboxing.

Difference between abstract class and interface.

Difference between primary key and unique key.

What is NOT NULL constraint.

What is foreign key.

SALARY table was given with some values. id name sex salary 1. A. m. 2500 2. B. f. 1500 3. C. m 4500 4. D. f. 2390 Here we need to swap the values of all m(male) with all f(female).

A table with query was given we need to tell what will be the result and why. how can we improve this query.

some c#.net output questions was given.