SQL refers to the base Structured Query Language which is an ANSI Standard. T-SQL, also known as Transact-SQL, is a "superset" of SQL which is used by Microsoft SQL Server and Sybase SQL Server. T-SQL supports all the commands that SQL supports, but SQL doesn't support all the commands that T-SQL supports. For more info: --- clarification: MySQL does ~not~ use T-SQL

SQL refers to the base Structured Query Language which is an ANSI Standard. T-SQL, also known as Transact-SQL, is a "superset" of SQL which is used by Microsoft SQL Server and Sybase SQL Server. T-SQL supports all the commands that SQL supports, but SQL doesn't support all the commands that T-SQL supports. <a href="http://searchsqlserver.techtarget.com/tutorial/T-SQL-Learning-Guide">For more info</a>: --- clarification: MySQL does ~not~ use T-SQL