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These events are insertion, deletion, and updating; things that change the content of the subject table.

Queries do not change the contents of the database, so they cannot fire a TRIGGER without an event.

The model used in SQL Server is fairly simple, but the full ANSI/ISO Standard is elaborate.

Triggers have to follow one of the basic principles of RDBMS, namely that when the transaction is finished, all of the constraints are true.

The ANSI/ISO Standard lets you pick how the code is executed.

This body of code is executed when a ‘schema event’ occurs.

Transact-SQL Syntax Conventions Is the name of the column to test for either an INSERT or UPDATE action.

Because the table name is specified in the ON clause of the trigger, do not include the table name before the column name.

Returns a Boolean value that indicates whether an INSERT or UPDATE attempt was made on a specified column of a table or view.

UPDATE() is used anywhere inside the body of a Transact-SQL INSERT or UPDATE trigger to test whether the trigger should execute certain actions.

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