All things SQL - tutorials, interview questions, and solutions

How to break down user activity by day of the week in SQL. Simple to pull, takes a few minutes to write the query, and data is easy to interpret and…
A roundup of my favorite free SQL tutorials and articles to either get started with or to keep your querying skills strong.
A classic SQL interview question for a data science position at Facebook with some offered solutions
SQL window function QUALIFY, its use-cases, and overview of SQL optimization practice
Building complex and advanced SQL queries for data analysis, data manipulation, and modeling
Learn how to install a database and practice SQL on your own to nail take-home assignments and interview questions
A recap of data analysis publications, news, and tutorials over the past month.
See all