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rama krishna 181rama krishna 181 

4. different events in triggers..?

4. different events in triggers..? 
Suraj TripathiSuraj Tripathi
Hi Rama Krishna,
 

There are 7 different Events in Trigger

1)before insert
2)before update
3)before delete
4)after insert
5)after update
6)after delete
7)after undelete


And you can refer below link for more information.

https://trailhead.salesforce.com/en/modules/apex_triggers/units/apex_triggers_intro

Thanks
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Ram Krishna,

May I suggest you please check the trailhead module on triggers.please check the link below. Hope it will be helpful.

Please mark it as best answer if the information is informative.so that question is removed from an unanswered question and appear as a proper solution.

Thanks
Rahul Kumar
Amit Chaudhary 8Amit Chaudhary 8

1) isExecuting Returns true if the current context for the Apex code is a trigger, not a Visualforce page, a Web service, or anexecuteanonymous() API call.
2) isInsert Returns true if this trigger was fired due to an insert operation, from the Salesforce user interface, Apex, or theAPI.
3) isUpdate Returns true if this trigger was fired due to an update operation, from the Salesforce user interface, Apex, or theAPI.
4) isDelete Returns true if this trigger was fired due to a delete operation, from the Salesforce user interface, Apex, or theAPI.
5) isBefore Returns true if this trigger was fired before any record was saved.
6) isAfter Returns true if this trigger was fired after all records were saved.
7) isUndelete Returns true if this trigger was fired after a record is recovered from the Recycle Bin (that is, after an undelete operation from the Salesforce user interface, Apex, or the API.)
8) new Returns a list of the new versions of the sObject records.Note that this sObject list is only available in insert and update triggers, and the records can only be modified in before triggers.
9) newMap A map of IDs to the new versions of the sObject records. Note that this map is only available in before update, after insert, and after update triggers.
10) old Returns a list of the old versions of the sObject records.Note that this sObject list is only available in update and delete triggers.
11) oldMap A map of IDs to the old versions of the sObject records.Note that this map is only available in update and delete triggers.
12) size The total number of records in a trigger invocation, both old and new.
http://amitsalesforce.blogspot.com/2015/10/trigger-context-variables.html

Let us know if this will help you
Gary RalstonGary Ralston
Hello rama, 

Salesforce supports several types of triggers that can be used to automate actions based on specific events. Here are the trigger events that are available in Salesforce:
  1. Before Insert
  2. Before Update
  3. Before Delete
  4. After Insert
  5. After Update
  6. After Delete
  7. After Undelete
In total, there are seven trigger events in Salesforce.

Want to learn more about Salesforce triggers? Check out this link at https://arrify.com/triggers-in-salesforce/ for comprehensive information on triggers in Salesforce. This article covers everything from the benefits of using triggers, to tips and best practices, and even how to hire a developer to set up your triggers. A must-read for anyone looking to automate their processes in Salesforce!