Paolo RedaelliRelaX – relational algebra calculator
The relational algebra calculator helps you learn relational algebra (RelAlg) by executing it.
If you want to learn SQL you take a database system and try some queries.
But if you want to learn relational algebra what do you use? Pen and paper?The relational algebra calculator helps you learn relational algebra (RelAlg) by executing it.
Well, that’s a REALLY fine piece of software. Sadly there’s no license…
Well, the source code is not complete. It works but it refers to a “calculator.bundle.js” which is the core of the application and it’s minimized – thus unreadable – code.
According to npm there are two candidate projects for those (See https://www.npmjs.com/search?q=relalg and https://www.npmjs.com/search?q=relational%20algebra )
– https://www.npmjs.com/package/relalg.js with its GitHub repository at https://github.com/fangel/RelAlg.js
– https://www.npmjs.com/package/relational.js (GitHub at https://github.com/erikolson186/relational.js )
I suspect he used the first. I cloned both just in case