A SQL Server trigger is a piece of procedural code. It is just like a stored procedure which is only executed when a given event happens. There are different types of events that can fire a trigger. To name you a few, the insertion of rows in a table, a change in a table structure...
Triggers in SQL Server - Learn about SQL Server triggers, their purpose, types, and benefits. Understand DML and DDL triggers with practical use cases.
Before showing how to use triggers in SQL Server, the first sections of this guide describe some basic database concepts that are needed to explain triggers: Primary and foreign keys are described, and an example database schema is introduced to show how they can create associations between ta...
such as a recursive CTE. For example, you could use the following trigger instead, ...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance You can specify that one of the AFTER triggers associated with a table be either the first AFTER trigger or the last AFTER trigger that is fired for each INSERT, DELETE, and UPDATE triggering actions. The AFTER triggers ...
Example: Use the inserted table in a trigger to enforce business rules Use the inserted and deleted tables in INSTEAD OF triggers Performance considerations Next steps Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance DML trigger statements use two special tables: thedeleteda...
Applies to: SQL Server 2008 (10.0.x) and later. Applies the scope of a DDL or logon trigger to the current server. If specified, the trigger fires wheneverevent_typeorevent_groupoccurs anywhere in the current server. WITH ENCRYPTION
If nested triggers are allowed and a trigger in the chain starts an infinite loop, the nesting level is exceeded and the trigger terminates. You can use nested triggers to perform useful housekeeping functions such as storing a backup copy of rows affected by a previous trigger. For example,...
that you can roll back the changes inside the trigger if you need to. But in your example, ...
In the following example, a DDL trigger prints a message if any CREATE_DATABASE event occurs on the current server instance. The example uses the EVENTDATA function to retrieve the text of the corresponding Transact-SQL statement. For more information about how to use EVENTDATA with DDL trigger...