Itzik Ben-gan T-sql Fundamentals -

You cannot hack your way through relational theory. You must understand it. Whether you are aiming for a promotion, a certification, or simply the respect of your peers, buying this book (or renting it via O’Reilly Online) and working through every single exercise is the highest-leverage activity you can do for your career in data.

He is the primary founder of SolidQ, a global training and consulting firm, and has been instrumental in shaping how professional developers think about set-based logic versus procedural programming. When Itzik speaks about query optimization or logical query processing, the product group at Microsoft listens. itzik ben-gan t-sql fundamentals

Itzik Ben-Gan’s Fundamentals is called that because it teaches the fundamental truths of relational theory , not because it is easy. An intermediate DBA who has been writing queries for five years will likely discover that they have been doing Outer Joins wrong or misunderstanding three-valued logic ( TRUE , FALSE , UNKNOWN ). Each chapter is filled with "Practice" questions. These are not simple "What is a SELECT statement?" questions. They are logic puzzles. For example: "Given a table with missing dates, write a query that returns the range of missing dates using a CTE and window functions." You cannot hack your way through relational theory

His writing is dense, precise, and mathematically rigorous—traits that can be intimidating at first but are ultimately liberating for anyone who truly wants to understand why a query behaves the way it does. Officially titled “T-SQL Fundamentals (3rd Edition)” (with the 4th edition rumored/highly anticipated by the community), this book serves as the official study guide for Microsoft certification exams (like DP-300 and the legacy MCSA exams) as well as the cornerstone of the Inside Microsoft SQL Server series. He is the primary founder of SolidQ, a