Getting Started with T-SQL: An Introduction to Writing T-SQL Queries

This book will quickly get you writing your first T-SQL query. SQL (Structured Query Language) is designed for managing data within relational databases. It is an important language to have some skill in for developers, report writers, and business analysts in all industries due to the prevalence of relational databases.
T-SQL is Microsoft's implementation of the language for use with it's SQL Server RDBMS (Relational Database Management System), but the SQL found in this book will apply equally well to other RDBMSs.
SQL has been the lingua franca of data for well over thirty years and shows no sign of going anywhere soon, so add this vital skill to your resume and get querying that valuable data.