Lesson: 26 | Update Annual Revenue

Apex Trigger

trigger AccountTrigger on Account (before update) {
    
    List<Opportunity> relatedOppList = [SELECT Id, Name, Amount FROM Opportunity
                                        WHERE StageName='Closed Won' AND AccountId =: Trigger.new.get(0).id];
	Decimal SumOfAmounts = 0;
    
    for(Account ac : Trigger.new){
        for(Opportunity opp: relatedOppList){
            SumOfAmounts += opp.Amount;
        }
        ac.AnnualRevenue=SumOfAmounts;
    }
}