The is a sample implementation for rgSQL written in Ruby.

rgSQL is a SQL database server that YOU get to build from scratch.

See the guide to Build a Database Server to get:

• A 13 chapter guide on how to build your rgSQL implementation.
• In depth explanations of how to write a parser, build a type checker, and create a query plan with iterators.
• Details about important SQL and relational database concepts such as atomicity and 3-valued logic.
• 30+ extension projects that add to your implementation.
• Ideas on how to structure and refactor your code, including a sample solution.
• Comparisons between rgSQL and databases such as PostgreSQL, MySQL, SQLite and DuckDB.
• Access to a Discord server to share solutions and ask for help.
• Instructions on how to work with the rgSQL test suite.