The events that trigger SQL Server triggers which are actually stored t-sql codes are sql INSERT, UPDATE and DELETE statements executed on a sql database table. For example, if you create trigger to execute after Insert statement on a sql table, when a new row or a set of new rows are...
Learn everything you need to know about triggers in SQL Server, from creating and using them to troubleshooting errors. Read on to know its pros and cons.
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 can contain direct references to tables by name, such as the trigger namedtestrefshown in this example: Suppose that you insert the following values into tabletest1as shown here: As a result, the four tables contain the following data: ...
The PL/SQL block or CALL subprogram that the database runs to fire the trigger. A CALL subprogram is either a PL/SQL subprogram or a Java subprogram in a PL/SQL wrapper. If trigger_body is a PL/SQL block and it contains errors, then the CREATE [OR REPLACE] statement fails. Restrictio...
The SELECT privilege on any table or view that is referenced in the search-condition of the triggered-action The privileges that are required to execute the statements in SQL-trigger-body If the SECURED option is specified, either SECADM authority or the CREATE_SECURE_OBJECT privilege is needed....
It is possible to define multiple triggers for a given table that have the same trigger event and action time. For example, you can have twoBEFORE UPDATEtriggers for a table. By default, triggers that have the same trigger event and action time activate in the order they were created. ...
Both AFTER and INSTEAD OF triggers support varchar(max), nvarchar(max), and varbinary(max) data in the inserted and deleted tables. For more information, see CREATE TRIGGER (Transact-SQL).Example: Use the inserted table in a trigger to enforce business rules...
In this example, after each update on ‘SALARY’ column ofemployee_salarywith hike greater than 50000, it will fire a ‘after update’ trigger and insert the new updated data into aemployee_salary_logtable. 2.1 Create tables and trigger. ...
For example: REFERENCING OLD_TABLE AS DeletedHotels allows you to use that new identifier (DeletedHotels) in the triggered-SQL-statement: DELETE FROM HotelAvailability WHERE hotel_id IN (SELECT hotel_id FROM DeletedHotels) The old and new transition tables map to ajava.sql.ResultSetwith cardinal...