R Books

T-SQL

T-SQL Fundamentals 4th Edition (MSPress, Coming Soon; Q1 2023)
T-SQL Fundamentals 3rd Edition (MSPress, 2016)
T-SQL Querying (MSPress, 2015)
T-SQL Window Functions 2nd Edition (MSPress, 2019)
Exam Ref 70-761 Querying Data with Transact-SQL (MSPress, 2017)

Set Theory

Set Theory and Logic (Dover Publications) by Robert R Stoll
Set Theory and Its Philosophy : A Critical Introduction (Oxford University Press) by Michael Potter

SQL and Relational Theory

SQL and Relational Theory: How to Write Accurate SQL Code (O’Reilly, 2015) by C. J. Date