With all the data scientist thought pieces out there, I really wish there was more in-depth discussion of SQL and highlighting of the other shenanigans you can do with query optimization, subqueries, and even analytic/window functions. (although that last one is apparently the Hello World equivalent in data sci: https://twitter.com/minimaxir/status/1094430576092704768)

As a data scientist, I spend a lot more time building queries than working with models.