How to compare old field value with the next field value in Salesforce?
Sample Trigger: trigger emailCheck on Employee__c (before update){ Map<Id,Employee__c> o = new Map<Id,Employee__c>(); o = trigger.oldMap; for(Employee__c n : trigger.new) { Employee__c old = new Employee__c(); old = o.get(n.Id); if(n.Email__c ....