Anyone know of a sample MySQL/PostgreSQL Database schema with unoptimised queries / no indexes etc suitable for a junior to play with and view the result of changes? Feels like something that should already exist

@unixdaemon I did a @Percona training many years ago. Not sure if this is still relevant though github.com/percona/traini…

@unixdaemon dumps.wikimedia.org is where I used to send people back in the day, it may still be a good destination (?)