Looking for recommendations on a "best" one or two books to read on SQL / PostgreSQL. Have any of you read Mastering PostgreSQL in Application Development[+]?

Looking for recommendations on a "best" one or two books to read on SQL / PostgreSQL. Have any of you read Mastering PostgreSQL in Application Development[+]? I'm aware it's a fairly recent title, but I'm in need of something like that and am wondering if it's worth the money. The free sample chapter looks promising, I'll give it that. I'm working my way through the official PostgreSQL docs, and they're really good, but I find myself struggling a bit (a lot). I'm fluent in a handful of programming languages (dabbled in many), and appreciate abstractions like HOFs and monads, but I'm finding it difficult to express myself in SQL, and that tells me some underlying concepts haven't quite clicked. [+] https://masteringpostgresql.com/ https://masteringpostgresql.com/