Data Science Educational Resources
StrataScratch is a data science educational platform with over 1,000+ real interview questions from your favorite companies.
SQL
SQL UNION vs UNION ALL: Differences You Need to Know
In this article, we’ll discuss differences and similarities between UNION vs UNION ALL, possible use cases, and compare the performance of two set operators.
Irakli Tchigladze -
Data Engineer SQL Interview Questions From Top Employers
In this article, we will list important SQL concepts and walk you through 10 data engineer SQL interview questions asked by employers like Google and Amazon.Irakli Tchigladze -
A Comprehensive Guide to CASE WHEN statements in SQL
Let’s explore the basic and advanced syntax of CASE WHEN statements in SQL and show how to use CASE statements to answer difficult interview questions in SQL.Irakli Tchigladze -
Postgres Aggregate Functions You Must Know
In this article, we’ll explain the most popular Postgres aggregate functions, discuss their use cases, and answer five interview questions by top employers.Irakli Tchigladze -
30 Product Analyst Interview Questions
Lacking confidence for the product analyst interviews? 30 questions, 7 topic categories, numerous interview tips, and practice opportunities will fix that.
Tihomir Babic -
Amazon SQL Interview Questions
Amazon SQL Interview Questions: The Real Patterns, Traps, and Query Skills Amazon Actually Tests.
Sara Nobrega -
Digging Deeper Into SQL Temp Tables
This article helps you unlock the power of SQL temporary or temp tables. Improve your query efficiency, data analysis, and data transformation with them.
Nathan Rosidi -
Mastering the SQL Subqueries With Multiple Tables
Mastering the tools to use subqueries involving multiple tablesNathan Rosidi -
MySQL Interview Questions
Interview questions to learn MySQL from the basics and get ready for your next Data Science Interview involving the most popular open-source SQL database in the world.
Vivek Sankaran -
Why SQL is THE Language to Learn for Data Science
Outdated, non-cool, and basic – is that what you think of it? SQL is none of that! Here’s why you can’t avoid it in data science, and it’s here to stay.Nathan Rosidi -
Mastering SQL DENSE_RANK(): A Comprehensive Guide
How do you use SQL DENSE_RANK() to rank data in SQL? This guide will help you become a master in SQL ranking window functions.Nathan Rosidi -
Advanced SQL Interview Questions You Must Know How to Answer
Advanced SQL interview questions that every data scientist should know. It is quite important to understand what is being tested and how you can prepare for it.Nathan Rosidi -