If you're a hacker interested in SQL and OLAP, you might enjoy Greenspun's (he of of Greenspun's tenth rule fame) writings on these subjects:

https://philip.greenspun.com/wtr/data-warehousing.html https://philip.greenspun.com/sql/

Although technically obsolete (as in talking about 90s database systems that have bitten the dust since then), that's a minor defect. He spends most effort on teaching timeless principles.