Comment by Jtsummers

https://pragprog.com/titles/pwrdata/seven-databases-in-seven... - A book by the same name. Instead of giving you a brief blurb on each database, the authors attempt to give you more context and exercises with them. Last updated in 2018 it covers PostgreSQL, HBase, MongoDB, CouchDB, Neo4J, DynamoDB, and Redis. The first edition covered Riak instead of DynamDB.