https://en.m.wikipedia.org/wiki/Algorithm

> In mathematics and computer science, an algorithm is a finite sequence of mathematically rigorous instructions, typically used to solve a class of specific problems or to perform a computation.

Looks good to me.

And did you just question "WHERE" and "ORDER BY" in SQL? I wouldn't do that. There are probably a ton of algorithms and optimizations done there. In my very naive understanding, quick sort is at least worth something.