My SQL practice, one folder per week. I'm working through a self-study plan to move into data/analytics engineering.
Each folder has the .sql files for that week plus a log (README.md) where I note how long each drill took, what I got wrong and what I learned. I've left my wrong attempts in.
Mostly using the Chinook and Northwind sample databases in SQLite, plus small setup scripts written by Claude for specific problems and LeetCode's SQL 50.