Question about Microsoft SQL Server 2000 Standard Edition for PC

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TRIGGER IN SQL

WHAT IS TRIGGER IN SQL. WHAT IS THE USE OF TRIGGER

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A trigger is a special kind of stored procedure that automatically executes when an event occurs in the database server. A trigger is really an event handler. SQL Server allows users to create triggers (event handlers) for 3 types of events:

  • DML Event - Occurs when a DML (Data Manipulation Language) statement: INSERT, UPDATE or DELETE, is executed.
  • DDL Event - Occurs when a DDL (Data Definition Language) statement: CREATE, ALTER, or DROP, is executed.
  • Logon Event - Occurs when a user logins to the Server.
There are 3 different types of triggers (event handlers) based on the types of events they are triggered by:
  • DML Trigger - Executes in response to a DML event.
  • DDL Trigger - Executes in response to a DDL event.
  • Logon Trigger - Executes in response to a logon event.

Posted on Jul 03, 2008

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