Show HN: SQLToy – a tiny relational database for learning SQL via code

I am a Javascript developer and I've used SQL for years but it's always been a bit of a black box. I recently learned about the SQL order of operations and the relational model and it kind of blew my mind. In the process of digesting this information I wrote my own database in Javascript which I think might help others in my same situation. The result is SQLToy.

It is a SQL database written in Javascript. It's under 500 lines of code (including comments) and has zero dependencies.

The purpose of SQLToy is not to use it as a database but to learn SQL. Instead of doing this from the "outside-in" by learning the query language you do it "inside-out" by going through the implementation of the most common SQL operators. Instead of just learning what the operators do, you also learn how they do it which (hopefully!) should lead to a much deeper level of understanding.

A detailed wiki walks through the code of 15 different SQL operations including SELECT, WHERE, JOINs, GROUP BY, Aggregate Functions COUNT, AVG, MAX, MIN to name a few.

The wiki can be found here: https://github.com/weinberg/SQLToy/wiki

Feedback appreciated!

This is great - love the detail this goes into.