Apex Trigger Example using Map

Here's an example of an Apex Trigger that uses maps to avoid the deletion of Leave Request object, if its parent Consultant's status is Approved and Type is Employee

In this example, the trigger is associated with the Leave Request object and is set to run after the records which are getting deleted. It then checks if the Parent Consultant's status is Approved and Type is Employee, it shows an error.

Using maps in this way allows the trigger to efficiently access and update the related records, rather than querying for them multiple times. This can help to improve the performance of the trigger and prevent issues with governor limits.