Interview Questions Answers in SQL PLSQL

abhishek jaiswal

{ City } pune
< Country > india
* Profession * oracle erp trainee
User No # 103819

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Question { TCS, 51875 }

What is the result, when NULL is compared with NULL?

Answer

Decode will return true if we compare null to null value.
select decode(commission_pct,null,0) from employees

Is This Answer Correct ?

1 Yes

0 No

Question { Cognizant, 368118 }

how to find the second highest salary from emp table?

Answer

select salary from employees a where &nth_highest_salary =(select count(distinct salary)
from employees b where a.salary<=b.salary)
/

Is This Answer Correct ?

1 Yes

0 No