LeetCode Medium 176 Amazon Interview SQL Question with Detailed Explanation

Question: leetcode.com/p...
In this video I solve and explain a medium difficulty leetcode SQL question using MySQL query. This question has been asked in Apple, Facebook, Amazon, Google, Adobe, Microsoft, Adobe interviews or what we popularly call FAANG interviews.
I explain the related concept as well. This question includes points to keep in mind to develop SQL queries.
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[@rushikeshjaisur6576]

We can use MAX(salary) to handle null .
with RankTable as
(select *,dense_rank() over(order by salary desc) as rnk from employee)
select MAX(salary) as SecondHighestSalary from RankTable where rnk = 2;

[@EverydayDataScience]

Yes, this query with MAX will work and take care of the null issue. Great catch. I wanted to put in a generalized solution so that if instead of "null", the question asks to return something else, then all all we have to do is replace that specified_value to the value asked.

[@sivasrimakurthi206]

@@EverydayDataScience makes sense. That is the whole purpose of using IFNULL.

[@meenayegan6634]

Alternate 1: case-when
------------------------------------
select case when dr = 2
then salary
else null
end
as secondHighestSalary
from
(
select *,
DENSE_RANK() over (order by salary desc) dr
from employee
)x
Alternate 2: coalesce
------------------------------
select coalesce
((
select salary
from
(
select *,
DENSE_RANK() over (order by salary desc) dr
from employee
)x where dr=2
), null) as secondHighestSalary

[@mohammedjunaidazhar1844]

SELECT MAX(salary) AS SecondHighestSalary
FROM Employee
WHERE salary < (SELECT MAX(salary) FROM Employee)
This query is working too.

[@chiragshetty3079]

can anyone hellp me with solution for mssql, i'm trying with offset but not getting the solution

[@sakshamp4488]

thankyou sir

[@EverydayDataScience]

Glad that you found the video useful 😊

[@ujjwalvarshney3188]

select max(case when x.ct >2 and x.rk=2 then salary when x.ct