SQL Coding Interview Question Using A Window Function (PARTITION BY) | Data Science Interviews

In this video, I'll walk you through a common SQL coding interview question that is asked in many data science interviews. This SQL question tests your knowledge of SQL window functions, specifically using a PARTITION BY. I'd consider this a simple SQL window function so let's test your knowledge on this question before diving into more complicated problems. Follow along with me and head to the question below.

Link to the question: https://platform.stratascratch.com/coding/9899-percentage-of-total-spend?python=&utm_source=youtube&utm_medium=click&utm_campaign=YT+description+link

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This series is for both beginner and intermediate data scientists and analysts interested in learning how to solve common data science interview questions in SQL. These are real data science interview questions. For some background context and an intro about what this series is about: https://bit.ly/36kKbxG

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Timestamps:

Intro: (0:00)
Interview Question: (0:11)
Explore the Dataset: (0:38)
Solution Approach: (1:27)
Coding - JOIN The Tables: (3:05)
Coding - Explanation of the SQL Window Function: (4:22)
Coding - Finishing up the Solution: (6:37)

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About The Platform:

I'm using StrataScratch, a platform that allows you to practice real data science interview questions. There are over 1000+ interview questions that cover coding (SQL and python), statistics, probability, product sense, and business cases.

I created this platform because I wanted to build a resource to specifically help prepare data scientists for their technical interviews and to generally improve their analytical skills. Over my career as a data scientist, I never was able to find a dedicated platform for data science interview prep. LeetCode and HackerRank were the closest but these platforms specifically serve the computer developer community so their questions focus more on algorithms that working with data.

So, if you want more interview practice with real data science interview questions, visit https://platform.stratascratch.com/coding?utm_source=youtube&utm_medium=click&utm_campaign=YT+description+link. All questions are free and you can even execute SQL and python code in the IDE, but if you want to check out the solutions from me or from other users, you can use ss15 for a 15% discount on the premium plans.

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Contact:

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Feel free to also email me at [email protected]
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