What is a trigger 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.
How trigger works in SQL?
A SQL trigger is a database object which fires when an event occurs in a database. We can execute a SQL query that will “do something” in a database when a change occurs on a database table such as a record is inserted or updated or deleted. For example, a trigger can be set on a record insert in a database table.
What are triggers in SQL Server with examples?
Example: If you insert a record/row into a table then the trigger related/associated with the insert event on this table will fire before the row passes all the constraints, such as primary key constraint and some rules. If the record/row insertion fails, SQL Server will fire the Instead of Trigger.
What is trigger with 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.
What is trigger types of trigger?
There are three types of triggers in SQL Server. DDL Trigger. DML Trigger. Logon Trigger.
What are types of triggers in SQL?
SQL Server has three types of triggers:
- DML (Data Manipulation Language) Triggers.
- DDL (Data Definition Language) Triggers.
- Logon Triggers.
What is the purpose of triggers?
The main purpose of triggers is to automate execution of code when an event occurs. In other words, if you need a certain piece of code to always be executed in response to an event, the best option is to use triggers.
What are the different in trigger?
8. What are the different in triggers? Explanation: Triggers are not possible for create, drop. Explanation: Triggers can be manipulated.
What is trigger explain?
A trigger is a block of code that is executed automatically from a database statement. Triggers is generally executed for DML statements such as INSERT, UPDATE or DELETE. It resides in a database code and is fired automatically when the database code requires to perform the INSERT ,UPDATE or DELETE statement.