Answers for "4th highest salary in mysql"

2nd highest salary in mysql

#2nd Most highest salary using Limit & Order By
SELECT Salary FROM (SELECT Salary FROM Employee ORDER BY salary DESC LIMIT 2) AS Emp ORDER BY salary LIMIT 1;

2nd highest salary in mysql

#Corelated Subquery
SELECT Id, Salary
FROM Employee e
WHERE 2=(SELECT COUNT(DISTINCT Salary) FROM Employee p
WHERE e.Salary<=p.Salary)