LeetCode Medium 1193 Interview SQL Question with Detailed Explanation

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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[gajendragada_dynamites]

This is the most underrated channel of you tube in linkedin also everyone is busy in praising Sumit mittal sir only, i will proudly say i have learnt SQL from this channel

[alfabinomial]

in your video u have taught us how to think and how to solve the problem !! best tutorial ever on Database management system !

[mickyman]

here somehow if we use month alias in group by, then too query works fine!!, but generally group by runs before select so alias shouldn't be working but here it does??!! :select DATE_FORMAT(trans_date, "%Y-%m") as month, country, count(*) as trans_count,
sum(case when state='approved' then 1 else 0 end) as approved_count, sum(amount) as trans_total_amount,
sum(case when state='approved' then amount else 0 end) as approved_total_amount
from transactions
group by month, country;

[rishikaverma]

why does my code show this error? You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') as approved_total_amount
from Transactions
group by date_format(trans_date, '' at line 2

select date_format(trans_date, '%Y-%m') as month, country, count(id) as trans_count, sum (case when state='approved' then 1 else 0 end) as approved_count, sum(amount) as trans_total_amount, sum(case when state='approved' then anount else 0) as approved_total_amount
from Transactions
group by date_format(trans_date, '%Y-%m'), country

[manojyadav]

count() only count the non-null values only.just for info