Practice SQL on real-world datasets with authentic data
This comprehensive data set from The Meteoritical Society contains information on all of the known meteorite landings. https://data.nasa.gov/dataset/meteorite-landings
This data set includes Pokemon statistics, including their number, name, first and second type, and basic stats: HP, Attack, Defense, Special Attack, Special Defense, and Speed. It has been of great use when teaching statistics to kids. With certain types you can also give a geeky introduction to machine learning.