HackerRank
Real Dev
Daily Coding Problem
CodinGame
Frontloops
Codewars
Code Racer
No nonsense, real world programming challenges

LeetCode
DataLemur
Datacamp
HackerRank
Codecademy
PrepNPlaced
SkillVee
StrataScratch is a data science interview platform that has over 1000+ real interview questions from top tech companies like Facebook, Amazon, Google, and more.

Which is more popular?
StrataScratch might be a bit more popular than hackattic. We know about 4 links to it since March 2021 and only 3 links to hackattic.
Website, pricing, platforms and company facts side by side.
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What each product offers, as listed by its team.

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An editorial look at what each product does well and who it suits.

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Practice Writing SQL Queries on StrataScratch | How to Solve SQL Queries
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StrataScratch offers free data science interview questions and continues to release interview questions when they come out from companies. This ensures that you are always practicing your data science skills on...
Recommendations tracked on public social media and blogs since March 2021.

I am aware of few of the resources which I've listed down below, will appreciate if you guys can share bit more. - https://hackattic.com/ : Interesting programming Problems. - Source: Hacker News / over 3 years ago
Also check out https://hackattic.com/ it has some really fun problems. - Source: Hacker News / about 4 years ago
What sort of programming would you like to do? Any real world challenges you are looking to solve? For practice “challenges” I really like https://hackattic.com/. Source: over 5 years ago
StrataScratch is focused on providing data analysis/science resources needed to land a job and resources for the first few years of your career. It has 600+ coding questions from real interviews where you can use SQL, python, or R. It... Source: over 3 years ago
I learned off of Mode Analytics SQL tutorial. It's free and I use it as a reference when I forget syntax. From there, my learning style is to grind on practical questions that I would get as a data analyst. So I would recommend... Source: over 3 years ago
There was a comment here about using Leetcode, Hackerrank, SQL fiddle, etc to keep learning SQL. However, if you're aim is to go into data analytics you need to go beyond learning syntax and understand edge cases and business context.... Source: over 3 years ago
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