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SQL Server FAQ - "INSERTED" - New Record of an DML Event Instance

By: FYIcenter.com

(Continued from previous topic...)

How To Access the Inserted Record of an Event?

When a DML event occurs, SQL Server will prepare a temporary table called "INSERTED", which contains the new record of the affected row, which is:

  • A copy of the inserted row for an INSERT statement.
  • A copy of the updated row for an UPDATE statement.
  • Empty for a DELETE statement.

The tutorial exercise below shows you how to create a trigger, update_user, to report email changes on table, fyi_users:

USE FyiCenterData;
GO

DISABLE TRIGGER dml_message ON fyi_users;
GO

CREATE TRIGGER update_user ON fyi_users
AFTER UPDATE
AS
  DECLARE @new VARCHAR(80);
  SELECT @new = email FROM INSERTED;
  PRINT 'Email changed to '+@new;
GO

UPDATE fyi_users SET email='john@fyicenter'
   WHERE name = 'John King';
GO
Email changed to john@fyicenter
(1 row(s) affected)

As you can see, the INSERTED table is helpful, if you want the trigger to perform specific logics on the affected rows.

(Continued on next topic...)

  1. What Are Triggers?
  2. What Are the Basic Features of a Trigger?
  3. How To Create a Simple Table to Test Triggers?
  4. How To Create a DML Trigger using CREATE TRIGGER Statements?
  5. How To Test a DML Trigger?
  6. How To List All Triggers in the Database with sys.triggers?
  7. How To Modify Existing Triggers using "ALTER TRIGGER"?
  8. How To Delete Existing Triggers using "DROP TRIGGER"?
  9. How To Get the Definition of a Trigger Back?
  10. How To Disable Triggers using "DISABLE TRIGGER"?
  11. How To Create a Trigger for INSERT Only?
  12. How To See the Event List of an Existing Trigger using sys.trigger_events?
  13. How To Access the Inserted Record of an Event?
  14. How To Access the Deleted Record of an Event?
  15. How To Improve the Trigger to Handle NULL Values?
  16. What Happens to a Trigger with Multiple Affected Rows?
  17. How To Override DML Statements with Triggers?
  18. How To Create a DDL Trigger using "CREATE TRIGGER" Statements?
  19. Can You Roll Back the DDL Statement in a Trigger?
  20. Can You Create a Logon Trigger in SQL Server 2005 Express Edition?

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