LeetCode 2205 'Number of Users Eligible for Discount' Interview SQL Question Detailed Explanation

In this video I solve and explain a 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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[sashankkanagala]

Why can't we simple use

SELECT COUNT(*) AS user_cnt
FROM (SELECT *
FROM purchases
WHERE
time_stamp BETWEEN '2022-03-08 00:00:00' AND '2022-03-20 00:00:00'
AND
amount >= 1000) AS finaltable

[mickyman]

how did we comapred data and timestamp dataypes without any casting?

[Abby-tsul]

Why if I use date_format(start_date, "%Y-%m-%d") to convert to year, month, day, it does not pass the test case?