hello-sql
Hello SQL is a free, open-source educational course teaching SQL fundamentals and relational database concepts from scratch. It covers 80+ lessons spanning MySQL 8.0+, PostgreSQL 16+, and practical SQL operations with ~7 hours of video instruction and accompanying code examples.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | mouredev/hello-sql |
| Owner | mouredev |
| Primary language | Python |
| License | Apache-2.0 — OSI-approved |
| Stars | 9.8k |
| Forks | 710 |
| Open issues | 8 |
| Latest release | Unknown |
| Last updated | 2025-03-31 |
| Source | https://github.com/mouredev/hello-sql |
What hello-sql is
Comprehensive SQL curriculum addressing CRUD operations (SELECT, INSERT, UPDATE, DELETE), schema management (CREATE/ALTER TABLE), relational modeling (1:1, 1:N, N:M), JOINs, aggregation functions, indexes, triggers, views, stored procedures, transactions, and programmatic access via Python connectors with SQL injection prevention.
Get the hello-sql source
Clone the repository and explore it locally.
git clone https://github.com/mouredev/hello-sql.gitcd hello-sql# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Video content delivery depends on external YouTube hosting; ensure organizational access to video platform or plan for offline distribution.
- Code examples assume local or development database setup (MySQL 8.0+, PostgreSQL 16+); verify compatibility with target database versions and infrastructure.
- Lessons are in Spanish (README and video); translation or supplementary English materials may be needed for non-Spanish-speaking teams.
- No interactive IDE or sandbox environment included; learners must provision their own MySQL/PostgreSQL instances or use provided setup steps.
- Course material does not address cloud-managed services (AWS RDS, Azure Database, Google Cloud SQL) or containerization (Docker) patterns.
When to avoid it — and what to weigh
- Proprietary/enterprise database expertise needed — Material focuses on MySQL and PostgreSQL; lacks coverage of SQL Server, Oracle, or cloud-native data warehouses (Snowflake, BigQuery, Redshift).
- Advanced query optimization required — Course emphasizes fundamentals; provides limited depth on query planning, indexes strategy, query tuning, or performance analysis at scale.
- Non-relational data modeling — Curriculum assumes relational schemas; does not address NoSQL, document stores, or non-normalized design patterns.
- Production database administration — Training is pedagogical rather than operational; lacks coverage of backup/restore, replication, high-availability, security hardening, or disaster recovery.
License & commercial use
Licensed under Apache License 2.0 (Apache-2.0), a permissive OSI-approved license allowing free use, modification, and distribution in commercial and proprietary contexts, provided license notices are retained.
Apache-2.0 permits commercial use without royalty or permission. The course material itself may be freely used, modified, and integrated into commercial training programs or internal documentation, provided Apache-2.0 attribution is maintained. However, associated video content on YouTube may be subject to separate terms; review YouTube's licensing policy and author's explicit grants before republishing video.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Strong |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
Course includes explicit SQL injection prevention module (lesson 19.2) with code examples. However, material is educational; implementations based on this course should undergo security review before production use. No guidance on access control, encryption at rest/transit, audit logging, compliance (GDPR, HIPAA), or vulnerability disclosure is provided.
Alternatives to consider
Mode Analytics SQL Tutorial
Interactive browser-based SQL learning with real datasets; no setup required; covers standard SQL without database-specific installation.
SQL Zoo
Interactive online platform with instant feedback; lower barrier to entry for beginners; covers core SQL syntax but less depth on schema design or advanced topics.
Udemy/Coursera SQL courses (e.g., The Complete Hands-On Introduction to Apache Cassandra)
Professionally produced, instructor-led, include certificates; broader coverage of multiple RDBMS and NoSQL; higher cost; may include live support.
Build on hello-sql with DEV.co software developers
Use this assessment to determine fit for your team's SQL onboarding. For production database architecture, security hardening, or advanced optimization, engage specialized database engineers.
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hello-sql FAQ
Can I use this course material in my company's internal training?
What database versions does the course cover?
Is the course suitable for non-English speakers?
What's the time investment to complete the course?
Custom software development services
Adopting hello-sql is usually one piece of a larger software development effort. As a software development agency, DEV.co provides software development services and web development expertise — pairing senior software developers and web developers with your team to design, build, and operate open-source databases software in production.
Evaluate Hello SQL for Your Training Program
Use this assessment to determine fit for your team's SQL onboarding. For production database architecture, security hardening, or advanced optimization, engage specialized database engineers.