Apex Triggers - 8 (Trigger Interview Question)

while inserting record getting this error OpportunityTrigger: execution of AfterInsert caused by: System.NullPointerException: Attempt to de-reference a null object Class.OpportunityTriggerHandler.sumofoppamountmethod: line 39, column 1 Trigger.OpportunityTrigger: line 5, column 1

when i tried it hitting this error OpportunityTrigger: execution of AfterInsert caused by: System.NullPointerException: Attempt to de-reference a null object

Hi Badal , In the past few weeks I have got immense confidence on Apex Triggers , Thank you for all your efforts.....
One thing I wanted to add is that we can have a check like only if Opportunity Amount field is updated then the whole logic should be applied else I guess there is no need to update the related accounts ?
Please correct me if I am wrong
Thank You

Is we change parent of two opportunities, the total amount field on the account updates only one of the opportunity amounts. Why is it so ?

Hii why we used totalAm field it doe not exist in opportunity obj

Hi! How do I filter it to capture only Closed Won Opportunities? Thank you.

Hi
I have scenario where total amount is not updating in the account field change on opportunity.
If account has only 1 opportunity and if parent account gets change, then total amount is not updating to 0.
Note: if i delete that opportunity, then total amount is updating to 0.

Brother if we remove line 58, then I guess line 68 to 77 will not be required?, please let me know

Bro you not doing as per best practice where is the trigger helper method

why you are not using handler class. is there any specific reason

Hii Badal, you can use that same technique to count number of contact instead of using inner query.

Thank you so much bro ...

undelete is not working please give the code link in the description

Thank you brother.