What are database triggers in SQL Server?

What are database triggers in SQL Server?

A trigger is a special type of stored procedure that automatically runs when an event occurs in the database server. DML triggers run when a user tries to modify data through a data manipulation language (DML) event. DML events are INSERT, UPDATE, or DELETE statements on a table or view.

Where is database trigger 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 create a trigger in SQL Server?

Using SQL Server Management Studio

1. In Object Explorer, connect to an instance of Database Engine and then expand that instance.
2. Expand Databases, expand the AdventureWorks2012 database, expand Tables and then expand the table Purchasing.
3. Right-click Triggers, and then select New Trigger.

How trigger is used in SQL Server with example?

Classes of SQL Server Triggers

1. FOR or AFTER [INSERT, UPDATE, DELETE]: These types of triggers are executed after the firing statement ends (either an insert, update or delete).
2. INSTEAD OF [INSERT, UPDATE, DELETE]: Contrary to the FOR (AFTER) type, the INSTEAD OF triggers executes instead of the firing statement.

What is SQL trigger example?

Trigger: A trigger is a stored procedure in database which automatically invokes whenever a special event in the database occurs. For example, a trigger can be invoked when a row is inserted into a specified table or when certain table columns are being updated.

How do you know if a table has a trigger?

To view the definition of a DML trigger

1. In Object Explorer, connect to an instance of Database Engine and then expand that instance.
2. Expand the database that you want, expand Tables, and then expand the table that contains the trigger for which you want to view the definition.

How do database triggers work?

A database trigger is special stored procedure that is run when specific actions occur within a database. Most triggers are defined to run when changes are made to a table’s data. Triggers can be defined to run instead of or after DML (Data Manipulation Language) actions such as INSERT, UPDATE, and DELETE.

Which SQL trigger does SQL Server not support?

SQL Server does not support the BEFORE trigger.

What is the difference between trigger and procedure?

Trigger and Procedure both perform a specified task on their execution. The fundamental difference between Trigger and Procedure is that the Trigger executes automatically on occurrences of an event whereas, the Procedure is executed when it is explicitly invoked.