@VarchasvH

Day 1 : Apache Spark Internals

May 26 · 5 min read · If you want to become a true PySpark SME, you need to go beyond writing transformations—you must understand how Spark actually executes them under the hood. In this post, we’ll break down Spark’s exec

LeetCode 262: Trips and Users

Feb 17 · 2 min read · Date: February 17, 2026Category: SQLTime Taken: 30 minutesDifficulty: Hard Problem Statement The cancellation rate is computed by dividing the number of canceled (by client or driver) requests with unbanned users by the total number of requests with...

LeetCode 601: Human Traffic of Stadium

Feb 16 · 2 min read · Date: February 16, 2026Category: SQLTime Taken: 15 minutesDifficulty: Hard Problem Statement Write a solution to display the records with three or more rows with consecutive id's, and the number of people is greater than or equal to 100 for each. Re...

LeetCode 1070: Product Sales Analysis III

Feb 13 · 2 min read · Date: February 13, 2026Category: SQLTime Taken: 15 minutesDifficulty: Medium Problem Statement Write a solution to find all sales that occurred in the first year each product was sold. For each product_id, identify the earliest year it appears in t...

LeetCode 1045: Customers Who Bought All Products

Feb 12 · 1 min read · Date: February 12, 2026Category: SQLTime Taken: 10 minutesDifficulty: Medium Problem Statement Write a solution to report the customer ids from the Customer table that bought all the products in the Product table. Link: Customers Who Bought All Prod...