External Resources
The following resources can help you learn SQL or deepen your knowledge. Some are games; others are tutorials or websites with explanations and exercises. Several linked resources are available only in German.
| Resource | Description |
|---|---|
| SQL Island | An excellent game for learning SQL—the classic. |
| SQL Tutorial | Lessons and exercises covering SELECT queries. |
| SQLZoo: Nobel Prizes | Exercises on SELECT queries. |
| SQLZoo: JOIN queries | Exercises on SELECT queries with joins. |
| Wichematik: SQL queries | Interactive exercises on SQL queries. |
| Wichematik: SQL mystery | A mystery in which SQL queries help you solve the case. Winner of the 2025 GI teaching award. |
| Inspector Smith’s Adventures | Another text adventure. |
| Mini-worlds for ER modelling | |
| Tino Hempel’s website | Extensive explanations covering the whole topic. |
| MaInLab database course | Materials for learning about relational databases. Many exercises can be tested directly in the SQL Browser. |