n^2 or worse is so easy to accomplish with embedded for loops. And adding indexes to a DB is a fairly common thing to do with even medium sized DBs. But I do w

n^2 or worse is so easy to accomplish with embedded for loops. And adding indexes to a DB is a fairly common thing to do with even medium sized DBs. But I do work for a very large company (not FAANG, but close) and so admittedly, the scale there is far larger than in most jobs, and knowing this stuff really does matter a lot more.