...but we've had full implementations of the relational model for decades, with great performance etc. It's just a query language. A DB can use whatever query language it implements. Just like JS, there were schemes before JS (including the working browser one before management made Eich redo it into JS), there were other languages used in the browser even!
Previously, I've seen it described (including on Wikipedia) that you were hired to embed Scheme, but then they made you change it right before delivery.
