Question { Wipro, 8949 }

what is the advantage of RAID

Answer

It is a storage device, like floppy or hard disk

RAID - Redundant Array of Independant Disks

RAID refers to a hard disk technology which can be used to
speed up data transfer and/or provide disk redundancy
through disk system fault tolerance.
RAID configurations are commonly found in data critical
applications.

Question { Cognizant, 167902 }

how to find nth highest salary

Answer

BY Tested in Postgres SQL : javedcc@gmail.com

select * from tablename as aliasname where (nth)= (select
count(sal) from tablename where aliasname.sal<=sal)

Question { 16085 }

how to find nth lowest salary

Answer

For All SQL , Tested in PostgresSQL : Javedcc@gmail.com

SELECT * FROM A
WHERE N = (SELECT COUNT(DISTINCT B.Column_Name ) FROM
B WHERE A.Column_Name >= B.Column_Name)

Is This Answer Correct ?

8 Yes

6 No