Data Science Educational Resources
StrataScratch is a data science educational platform with over 1,000+ real interview questions from your favorite companies.
SQL
Understanding FLOOR and CEILING Functions in SQL
We explore fundamental concepts of FLOOR and CEILING functions in SQL and demonstrate their value for interview preparation and handling data at scale.
Shivani Arun -
How to Create Pivots in SQL (with examples)
Reshaping data using Pivots is table-stakes in data science. Learn about its importance, techniques, and implementation.Shivani Arun -
A Comprehensive Step-by-Step Guide to Full Outer Join in SQL
The FULL OUTER JOIN is a very useful but often overlooked SQL join. In this article, we’ll discuss how it works, when to use it, and give practical examples.
Nathan Rosidi -
How to Find the Minimum Value in SQL (with Examples)
Finding the minimum in SQL is easy: just use the MIN() aggregate function. In this article, you will learn how to do it in different real-case scenarios.Nathan Rosidi -
Mastering Row Number Handling in SQL Queries
ROW_NUMBER() is one of the essential ranking window functions in SQL. Learn where you can use it and how it works with ORDER BY and PARTITION BY window clauses.Nathan Rosidi -
Finding Maximum Values in SQL: Aggregation Techniques
MAX() in SQL is a straightforward aggregation method for finding maximum values. Learn here about its syntax and use cases through real interview examples.Nathan Rosidi -
CONCAT() in SQL: Tips and Techniques for Efficient Queries
CONCAT() in SQL is a data concatenation method. Learn about the tips, techniques, and practical examples of how to use it efficiently in SQL queries.Nathan Rosidi -
PySpark SQL Functions: Boost Big Data Processing with SQL
Leverage PySpark SQL Functions to efficiently process large datasets and accelerate your data analysis with scalable, SQL-powered solutions.Nathan Rosidi -
Counting Distinct Values in SQL: Tips and Examples
Using SQL COUNT(DISTINCT) is an easy way to count distinct values in SQL. However, it has its own quirks, which we’ll explain (with examples) in this article.Nathan Rosidi -
How Do You Perform SQL LIKE Queries for Pattern Matching?
The LIKE SQL query allows you to perform a pattern-matching search of your text data. Learn how to use it and add wildcards for increased flexibility.Nathan Rosidi -
Utilizing DENSE_RANK for Data Deduplication in SQL
Data deduplication in SQL can be done in several ways. Using DENSE_RANK() is one. Today, we’ll talk about using this function to improve your data’s quality.Nathan Rosidi -
SQL PARTITION BY: Advanced Analytical Insights
SQL PARTITION BY makes SQL window functions – already a powerful analytical tool – even more suitable for advanced analytical insights from your data.Nathan Rosidi -