CREATE TRIGGER specifies the enclosing Schema, names the Trigger and defines the Trigger’s Table, action time, event and body. To destroy a Trigger, use the DROP TRIGGER statement. To change an existing Trigger, drop and then redefine it.
How do you stop a trigger in SQL Server?
In Object Explorer, connect to an instance of Database Engine and then expand that instance. Expand the database that you want, expand Tables, and then expand the table that contains the trigger that you want to disable. Expand Triggers, right-click the trigger to disable, and then click Disable.
How do you drop a trigger from a table?
You can remove a trigger by dropping it or by dropping the trigger table. When a table is dropped, all associated triggers are also dropped. When a trigger is dropped, information about the trigger is removed from the sysobjects and syscomments system tables. Use DROP TRIGGER and CREATE TRIGGER to rename a trigger.
How do you return a trigger in SQL?
You can use the sys. triggers catalog view to return a list of triggers in a database in SQL Server. This view contains a row for each object that is a trigger, with a type of TR or TA.
How do you tell if SQL trigger is firing?
To test if a trigger fires you can add a PRINT statement to the trigger (e.g. “PRINT ‘trigger fired!’ “), then do something that should trigger the trigger. If you get the printed text in your messages-tab in management studio you know it fired.
How do I disable a trigger?
To disable a trigger, you use the ALTER TRIGGER DISABLE statement:
- ALTER TRIGGER trigger_name DISABLE;
- ALTER TRIGGER customers_audit_trg DISABLE;
- ALTER TABLE table_name DISABLE ALL TRIGGERS;
- ALTER TABLE customers DISABLE ALL TRIGGERS;
Which statement will drop a trigger?
The DROP TRIGGER statement drops a database trigger from the database. The trigger must be in your schema or you must have the DROP ANY TRIGGER system privilege.
Which statement is used to remove a trigger?
Which statement is used to remove a trigger? Explanation: In order to delete a trigger, the DROP TRIGGER statement is used. The DROP TRIGGER construct is used by writing the phrase ‘DROP TRIGGER’ followed by the scheme name specification.
What command is used to removing trigger?
You can remove triggers using the Remove Physical File Trigger (RMVPFTRG) command, the SQL DROP TRIGGER statement, or System i® Navigator. Use the RMVPFTRG command to remove the association of a file and the trigger program.
Can we fire a trigger manually?
Triggers cannot be manually executed by the user. There is no chance for triggers to receive parameters.
What does a trigger function return?
A trigger function must return either NULL or a record/row value having exactly the structure of the table the trigger was fired for.
Why do we use triggers in SQL?
Because a trigger resides in the database and anyone who has the required privilege can use it, a trigger lets you write a set of SQL statements that multiple applications can use. It lets you avoid redundant code when multiple programs need to perform the same database operation.
How do you invoke a trigger to test it?
To test Trigger, we need to execute the SQL query embedded in the trigger independently first and record the result. Then execute the trigger as whole and Compare the results. Triggers are useful for enforcing business rules, validating input data, and keeping an audit trail etc.
How do I test triggers in SQL Server?
To view database level triggers, Login to the server using SQL Server management studio and navigate to the database. Expand the database and navigate to Programmability -> Database Triggers. To view triggers at the server level, Login to Server using SSMS and navigate to Server Objects and then Triggers folder.
How do I know if my trigger is insert or update?
Triggers have special INSERTED and DELETED tables to track “before” and “after” data. So you can use something like IF EXISTS (SELECT * FROM DELETED) to detect an update. You only have rows in DELETED on update, but there are always rows in INSERTED . Look for “inserted” in CREATE TRIGGER.