Data Science Educational Resources
StrataScratch is a data science educational platform with over 1,000+ real interview questions from your favorite companies.
SQL
Computing Cumulative Sum in SQL Made Easy
Showing you what the cumulative sum is and how to calculate it in SQL. We’ll go through three distinct methods, so you can use whichever method you like best.
Nathan Rosidi -
SQL COALESCE() Function: A Guide for PostgreSQL Users
Learn how to handle null values with ease and efficiency using the versatile COALESCE() function in PostgreSQL, with practical examples and insights.Nathan Rosidi -
SQL BETWEEN Operator: Selecting the Range of Values
Learn how to select the data interval using the SQL BETWEEN. We will show you its syntax and different scenarios of using it in filtering and labeling data.Nathan Rosidi -
Technical Skills Needed as a Data Analyst with 1-2 Years of Experience
An overview of the top must-have technical skills a data analyst needs to stay competitive in the job market.
Vivek Sankaran -
Uber SQL Interview Questions
Breaking down the solution to one of the interesting Uber SQL interview questions
Irakli Tchigladze -
Illustrated Guide About Self Join in SQL
Mastering SQL Self Joins: how they work, why they multiply rows, and when to use them for comparisons, retention, and deduplication.Nathan Rosidi -
What Is SQL GROUP BY and How to Use It?
The article discusses the seven most typical uses of SQL GROUP BY. We’ll go through its syntax and coding examples to give a taste of real-life SQL coding.Nathan Rosidi -
Learn to Use a Recursive CTE in SQL Query
A detailed tutorial on Recursive Common Table Expressions (CTE) in SQL. We’ll show you examples of how to use them and compare them with Non-Recursive CTEs.Nathan Rosidi -
Business Analyst Interview Questions
The ultimate guide for all the business analysts trying to choose the questions they should prepare for a job interview.Nathan Rosidi -
Amazon Data Science Interview Questions
In this article, we’ll solve one of the Amazon data science interview questions to show how to approach these questions the right way.Irakli Tchigladze -
Basic SQL Interview Questions
In this article, we will go over some basic SQL interview questions asked during the interviews and how to approach solving them easily.Nathan Rosidi -
Ranking in Python and SQL
In this article, we will explore the ranking parameters that can help you handle the ranking tasks in a more efficient and accurate manner.Nathan Rosidi -