DataLemur
Solve real SQL and data science interview questions
DataLemur gives you SQL and data science interview questions tagged with the companies that asked them, such as Google, Amazon, Tesla and Stripe. You write SQL or Python to solve each one, or answer statistics and machine learning questions. Questions are marked easy, medium or hard.
Freemium · Browser · Intermediate
About DataLemur
It trains the SQL and data skills that data analyst and data scientist interviews test. It suits people preparing for those roles, from basic queries to harder window function problems.
The site has a free SQL tutorial and a free nine-day interview crash course. A Premium plan is also offered. Nick Singh made it. He wrote the book Ace the Data Science Interview and has worked at Facebook and Google.
On Breakpoint since 23 Oct 2026.