SQLBolt
SQLZOO
DataLemur
The Odin Project
SQL School
HackerRank
LeetCode
LiveEdu.tv
Data Analytic System
CoinGecko
CoinMarketCap
Crypto Price Monitor
Cryptoradar
Node Analytics
OpenMarketCap
Data Analytic System (DAS) is an educational crypto-market platform run by Data Analytic Investments Kft. (Budapest, EU).
What it offers: - Live, sourced market-data dashboards for BTC, ETH, XRP, SOL and other major assets, plus equity indices, FX and commodities - A MiCA / CASP authorisation status tracker for EU exchanges, based on ESMA data - Documentary, source-backed market studies and research articles - A free glossary of key terms and 8 free learning modules - Multilingual educational e-books (English, Hungarian, Spanish), including 'RIPPLE - An Unofficial Documentary Study of Ripple and the XRP Ledger', a 22-chapter book in which every factual claim carries a named, verifiable source
Every data panel names its source. The content is produced with a documented human+AI verification workflow (Uncle Sunny Academy).
Social: https://www.youtube.com/@dataanalyticsystem - https://www.instagram.com/dataanalyticsystem/ - https://www.tiktok.com/@dataanalyticsystem.com - https://www.facebook.com/dataanalyticsystem - https://x.com/dataanalyticsys
Educational content only - not investment advice. Independent publication, not affiliated with Ripple Labs Inc.
Data Analytic SystemSQLBolt is recommended for beginners who are new to SQL or those with limited experience who need a refresher on basic concepts. It is also useful for anyone who prefers learning through interactive and practical exercises rather than purely theoretical content.
Data Analytic System's answer:
Price trackers like CoinGecko or CoinMarketCap show numbers; Data Analytic System shows the numbers together with their source, date and context, and adds what trackers do not: an ESMA-based MiCA/CASP status list for EU exchanges, sourced documentary studies, a free glossary and learning modules, and multilingual e-books (EN, HU, ES). The free tier has no delay and the same data as the paid tier. We do not sell trading calls or recommendations of any kind.
Data Analytic System's answer:
Every data panel and every article names its source and date. The platform is run by a small Budapest-based publisher (Data Analytic Investments Kft.) and combines live market data for crypto, equity indices, FX and commodities with an EU MiCA/CASP authorisation tracker, a free glossary and learning modules, and documentary studies such as the RIPPLE book, in which every factual claim carries a verifiable reference. Content is produced with a documented human+AI verification workflow (Uncle Sunny method): a human editor closes every item. Educational content only, not investment advice.
Data Analytic System's answer:
People who want to understand crypto and macro markets rather than be told what to do: self-directed readers, students, journalists and compliance-minded professionals in the EU, plus Hungarian- and Spanish-speaking readers who lack sourced material in their language. Typical use: checking a data point with its source, reading the MiCA status of an exchange, or working through a learning module.
Data Analytic System's answer:
Data Analytic Investments Kft. was founded in Budapest in 2026 by Janos Szabo. The starting point was frustration with crypto content that mixes facts, opinion and promotion without references. The answer was a publishing method (Uncle Sunny) in which nothing is published before it is challenged and sourced, and a site built around that rule. The first flagship product was the RIPPLE documentary study (ISBN 978-615-83207 series, HU/EN/ES); the market-data dashboards, the MiCA tracker and the learning sections followed.
Data Analytic System's answer:
A TypeScript/React web application with server-side rendering, a MySQL database, and Stripe for payments. Market data comes from public exchange and data-provider APIs; regulatory data from ESMA registers. The editorial workflow uses several AI systems under human review, with every published claim tied to a named source.
Based on our record, SQLBolt seems to be more popular. It has been mentiond 125 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.
Disclosure: I help build these simulators; they are part of 50+ free DevOps games and simulators. For more practice beyond them, SQLBolt and PostgreSQL Exercises are excellent and free, and SQL Murder Mystery is the most fun anyone has ever had with a schema. - Source: dev.to / 7 days ago
I hope this helps you with interview prep as it does to me. I find https://sqlbolt.com/ super helpful if you want to learn SQL queries in depth. Thanks! - Source: dev.to / 6 months ago
SQLBolt - Introduction to SQL - Browser-based interactive tutorial with progressive lessons and immediate practice exercises, offering a quick and practical way to learn SQL fundamentals directly in your browser without setup, though it lacks formal certification and may not cover advanced database administration topics. - Source: dev.to / 9 months ago
To overcome these challenges, I relied on SQL documentation, online tutorials, and practice sites like DataLemur and SQLBolt. These resources were invaluable in helping me build confidence and refine my skills. - Source: dev.to / 9 months ago
SQLBolt focuses exclusively on giving you hands-on practice with increasingly complex queries. The platform starts with simple SELECT statements and progressively moves to complex joins and subqueries. You'll get immediate visual feedback while the site explains concepts briefly before each practice section. - Source: dev.to / over 1 year ago
SQLZOO - SQLZoo includes tutorials and reference to support people learning SQL. It features:
CoinGecko - CoinGecko is a free to use web-based and mobile application that provides financial market data for more than 2000 digital currencies.
DataLemur - Practice SQL Interview Questions & Data Science Interview Questions asked by FAANG.
CoinMarketCap - Crypto-currency market capitalizations.
The Odin Project - How it works. This is the website we wish we had when we were learning on our own. We scour the internet looking for only the best resources to supplement your learning and present them in a logical order.
Crypto Price Monitor - Track crypto prices and get email alerts for Bitcoin, Ethereum, Solana, and more.
