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500+ Interview Coding Questions From Your Favorite Companies
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Track real interview questions from your favorite companies with regular updates
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Code your solutions in SQL and python using our code-execution environment that lets you validate your solution
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We focus on teaching you how to solve real-world data science problems, not just proper coding syntax
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Data Science Educational Resources
Using Principal Component Analysis in R for Real-World Data
A hands-on guide to using PCA in R with DoorDash data—cleaning, visualising, and modelling compressed dimensions that actually make sense.
Nathan Rosidi - April 23, 2025
Looping Through Lists in Python: A Comprehensive Tutorial
Learn how to loop through a list in Python using real Uber data, practical techniques, and performance-friendly tips.
Nathan Rosidi - April 9, 2025
A Comprehensive Step-by-Step Guide to Full Outer Join in SQL
Nathan Rosidi - March 25, 2025
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