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Basit's SQL Server Tips

Basit Farooq is a Lead Database Administrator, Trainer and Technical Author. He has more than a decade of IT experience in development, technical training and database administration on Microsoft SQL Server platforms. Basit has authored numerous SQL Server technical articles, and developed and implemented many successful database infrastructure, data warehouse and business intelligence projects. He holds a master's degree in computer science from London Metropolitan University, and industry standard certifications from Microsoft, Sun, Cisco, Brainbench, Prosoft and APM, including MCITP Database Administrator 2008, MCITP Database Administrator 2005, MCDBA SQL Server 2000 and MCTS .NET Framework 2.0 Web Applications.

Understanding Triggers

A trigger is a specialized stored procedure that activates (executes) in response to an event. There are two basic trigger types, ie data manipulation language (DML) trigger and data definition language (DDL) trigger, based on the type of event that causes them to fire. For example, a data manipulation language (DML) trigger fires in response to INSERT, UPDATE, or DELETE events on a specific table whereas a data definition language (DDL) trigger fires in response to a data definition event, such as creating or dropping an object.

DDL triggers can have a scope of a database or the server. DDL triggers were introduced as a new feature with SQL Server 2005. The scope of a DML trigger is a table. Earlier versions of SQL Server support only DML triggers.

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