What is Salesforce Trigger

Salesforce Trigger:-

Salesforce trigger is apex code that executes before or after the folowing types of operations.

insert - You can have this trigger run before or after objects records are inserted into database.
update - You can have this trigger run before or after objects records are updated into database.
delete - You can have this trigger run before or after objects records are deleted from database.
merge - Merge events do not fire their own trigger events. Instead, they fire delete and update event
upsert - Fire both before and after insert or before and after update triggers as appropriate
undelete- record is restored from the Recycle Bin

I will be explaining each trigger with example in next tutorial.

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