一、database landscape
Google + ”database landscape“
https://www.google.com.hk/search?newwindow=1&safe=strict&biw=1280&bih=698&tbm=isch&sa=1&ei=9VOwXNPfC4OW8gXHhICQAw&q=database+landscape&oq=database+landscape&gs_l=img.3...0.0..199500...0.0..0.0.0…0…gws-wiz-img.7UwpyLzSMMM#imgrc=_
有兩張圖比較有意思：
https://connected-data.london/2017/07/04/connected-data-landscape/
二、database Encyclopedia
Knowledge Base of Relational and NoSQL Database Management Systems。
https://db-engines.com/en/articles
三、graph database
https://www.datanami.com/2017/11/30/look-graph-database-landscape/