« Back to Glossary Index
Visit Us
Follow Me

Transact-SQL (T-SQL) is a proprietary extension of the SQL (Structured Query Language) used by Microsoft SQL Server and Sybase relational database management systems. T-SQL enhances the standard SQL language with additional features and capabilities specific to these database systems.

Key features and functionalities of Transact-SQL include:

  1. Data Manipulation: T-SQL provides a rich set of commands for manipulating and managing data in a database. This includes SELECT for retrieving data, INSERT for adding new records, UPDATE for modifying existing data, and DELETE for removing records.
  2. Stored Procedures: T-SQL supports the creation and execution of stored procedures, which are precompiled sets of SQL statements that can be executed repeatedly. Stored procedures offer improved performance, reusability, and security.
  3. Control Flow: T-SQL includes control flow statements such as IF…ELSE, WHILE, and CASE for implementing conditional logic and looping constructs within queries and stored procedures.
  4. Transactions: T-SQL provides transactional support to ensure data consistency and integrity. Transactions allow for groups of database operations to be executed as a single atomic unit, ensuring that all changes are committed or rolled back together.
  5. Error Handling: T-SQL supports error handling through TRY…CATCH blocks, allowing for the trapping and handling of errors that may occur during the execution of SQL statements.
  6. Views: T-SQL allows the creation of views, which are virtual tables derived from one or more tables or other views. Views provide a way to simplify complex queries, encapsulate logic, and present a customized view of the data.
  7. User-Defined Functions: T-SQL supports the creation of user-defined functions, which are reusable code blocks that can be called within SQL statements. Functions allow for the encapsulation of complex logic and calculations.
  8. Security: T-SQL includes security features such as the ability to define user roles and permissions, granting or revoking access to database objects, and implementing row-level security.

T-SQL is specific to Microsoft SQL Server and Sybase databases, and while it shares similarities with standard SQL, there are differences in syntax and functionality. T-SQL offers a powerful and comprehensive set of tools for managing and manipulating data within these database systems.

You may also like...