What Is A Trigger And What Is Its Purpose?

What is the function of trigger?

A trigger function allows a business activity to be associated directly with a database file (i.e.

the “object”).

When a specified event happens to information in the file, then the trigger(s) will be automatically invoked..

What is trigger level?

A trigger level is a level to which material in a tank either falls or rises and triggers some action. To continuously monitor when a tank reaches a trigger level, define and activate a trigger subroutine in the initialization logic.

How do you write a trigger?

Creating TriggersCREATE [OR REPLACE] TRIGGER trigger_name − Creates or replaces an existing trigger with the trigger_name.{BEFORE | AFTER | INSTEAD OF} − This specifies when the trigger will be executed. … {INSERT [OR] | UPDATE [OR] | DELETE} − This specifies the DML operation.More items…

How do I identify my triggers?

Listen to your mind and body. A key step in learning to recognize your triggers involves paying attention when situations generate a strong emotional response. … Step back. When you notice these signs, stop to consider what just happened and the response it activated. … Trace the roots. … Get curious.

Why triggers are used in Salesforce?

Typically, you use triggers to perform operations based on specific conditions, to modify related records or restrict certain operations from happening. You can use triggers to do anything you can do in Apex, including executing SOQL and DML or calling custom Apex methods.

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.

What is trigger and types of trigger?

A trigger defines a set of actions that are performed in response to an insert, update, or delete operation on a specified table. Triggers can be used, along with referential constraints and check constraints, to enforce data integrity rules. …

What are the different types of triggers?

Types of TriggersData Manipulation Language (DML) Triggers. DML triggers are executed when a DML operation like INSERT, UPDATE OR DELETE is fired on a Table or View. … Data Definition Language (DDL) Triggers. … LOGON Triggers. … CLR Triggers.

What is an example of a trigger?

The definition of a trigger is the mechanism on a gun that makes it shoot a bullet or anything that starts a series of events. An example of trigger is what a cop presses to fire his gun. An example of trigger is a hostile confrontation that causes a series of bad memories with the person.

What are the after triggers?

What are the after triggers? Explanation: AFTER TRIGGERS can be classified further into three types as: AFTER INSERT Trigger, AFTER UPDATE Trigger, AFTER DELETE Trigger. Explanation: Example : declare @empid int; where empid is the variable.

What Cannot have a trigger associated with it?

Since triggers execute as part of a transaction, the following statements are not allowed in a trigger:All create commands, including create database, create table, create index, create procedure, create default, create rule, create trigger, and create view.All drop commands.alter table and alter database.More items…

What is the difference between trigger and stored procedure?

Stored procedures can be invoked explicitly by the user. … On the other hand, trigger is a stored procedure that runs automatically when various events happen (eg update, insert, delete). Triggers are more like an event handler they run at the specific event. Trigger can not take input and they can’t return values.