T-SQL
T-SQL (Transact-SQL) is Microsoft's proprietary extension to the SQL (Structured Query Language) standard, specifically designed for use with Microsoft SQL Server and Azure SQL Database. It adds procedural programming features, local variables, error handling, and system functions to standard SQL, enabling developers to write complex queries, stored procedures, triggers, and functions. T-SQL is essential for managing, querying, and manipulating data within Microsoft's SQL Server ecosystem.
Developers should learn T-SQL when working with Microsoft SQL Server or Azure SQL Database, as it is the primary language for database development, administration, and data analysis in these environments. It is particularly useful for creating stored procedures to encapsulate business logic, optimizing query performance with advanced features like window functions, and integrating with .NET applications through CLR integration. T-SQL is critical for roles involving database programming, ETL processes, and backend development in Microsoft-centric tech stacks.