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SQLMaxx
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SQLMaxx helps career switchers learn SQL well enough to land an entry-level data analyst job, even if they have never opened a database before.
SQL is the one skill almost every analyst interview screens for, yet most people learn it the hard way: jumping between tutorials, courses, and question banks, finishing a few, and forgetting half within a week. Tutorials end. Question banks assume you already know SQL on the first problem. Nothing tells you whether you are actually ready.
SQLMaxx replaces all of that with one engine. You move through 66 concepts in dependency order, from SELECT to complex CTEs, so you are never asked to write SQL you have not been taught. After every answer, the engine updates a real measure of how well you know each concept, then brings each one back for a short review right before you would forget it. That spaced review is what makes SQL stick instead of fading once the course ends.
Get a query wrong and Maxx, the built-in AI grader, explains in three sentences what your query did, the rule behind the result, and the pattern the problem wanted. It is included on every plan.
What makes it different:
-It adapts up and down to your level. Most courses and question banks are the same for everyone. -It tells you when you are ready. When all 66 concepts read green, the SQL part of an analyst interview is handled. Most tools never tell you where you stand. -You practice on real business data in a real Postgres database in your browser, not toy examples.
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SQLMaxx's answer:
SQLMaxx is built around an engine that measures what you actually know, not just what you have clicked through. As you practice, it tracks a real probability that you have learned each of the 66 SQL concepts, brings each one back for review right before you would forget it, and explains every wrong query in plain language. Most tools hand you lessons and problems and leave you to guess whether you are ready. SQLMaxx tells you.
SQLMaxx's answer:
Most SQL courses and question banks are the same for everyone. They end when the videos end, assume you already know SQL on the very first problem, and never tell you whether you have actually retained anything. SQLMaxx adapts to you, both up and down, so it meets a true beginner and still stretches a stronger learner. It brings concepts back before you forget them, explains exactly what went wrong on each query, and gives a clear readiness signal: when all 66 concepts read green, you are ready for an entry-level analyst interview.
SQLMaxx's answer:
Career switchers and beginners who want to break into data analytics, including people who have never opened a database before. SQL is the main skill that entry-level analyst interviews screen for, and SQLMaxx is built to take someone from zero to interview-ready. It is made for self-taught learners who keep bouncing between tutorials and never feel ready, rather than for teams or enterprises.
SQLMaxx's answer:
SQLMaxx started from a common frustration: people trying to break into analytics jump between tutorials, courses, and question banks, finish a few, forget half, and still have no idea whether they are ready. The best learning systems in other fields, like the adaptive math programs that measure mastery and schedule review at the right moment, solve this by tracking what a learner truly knows. No one had built that for SQL. SQLMaxx is that system: a single adaptive engine that maps the 66 concepts an analyst needs, measures your grasp of each one, and tells you the moment you have it. It is independently built, focused on doing one thing well.
SQLMaxx's answer:
Based on our record, StrataScratch seems to be more popular. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
StrataScratch is focused on providing data analysis/science resources needed to land a job and resources for the first few years of your career. It has 600+ coding questions from real interviews where you can use SQL, python, or R. It has 500+ questions about ML theory, product sense, probability, statistics, also from real interviews. There are data projects that come from take home assignments companies give... Source: about 3 years ago
I learned off of Mode Analytics SQL tutorial. It's free and I use it as a reference when I forget syntax. From there, my learning style is to grind on practical questions that I would get as a data analyst. So I would recommend stratascratch because all their questions are from real data science interviews which not only test for syntax but edge cases and business logic. Other platforms basically only test for... Source: about 3 years ago
There was a comment here about using Leetcode, Hackerrank, SQL fiddle, etc to keep learning SQL. However, if you're aim is to go into data analytics you need to go beyond learning syntax and understand edge cases and business context. You should grind on some data analytics/data science focused platforms like stratascratch and interviewquery. They have hundreds of questions with many free ones for your to practice. Source: about 3 years ago
If you want some practice interview questions, check out DataLemur and/or StrataScratch. They helped me immensely in preparing for technical interviews. Source: about 3 years ago
LeetCode - Practice and level up your development skills and prepare for technical interviews.
DataLemur - Practice SQL Interview Questions & Data Science Interview Questions asked by FAANG.
Datacamp - DataCamp is a massive open online course (MooC) platform that helps everyone from novices to experts hone their skills with data science.
Codecademy - Learn the technical skills you need for the job you want. As leaders in online education and learning to code, weโve taught over 45 million people using a tested curriculum and an interactive learning environment.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Mode - A complete analytical toolkit, free forever