Set Hot Rating for Media Industry Accounts

This trigger updates an Account’s Rating to “Hot” whenever its Industry field is set to “Media,” whether during creation or updates.

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Solution:

trigger AccountTrigger on Account (before update) {

            if(Trigger.isUpdate){ if(Trigger.isBefore){
                  AccountTriggerHandler.updateIndustryRating(Trigger.New, Trigger.oldMap);
         }
     }
}
         public class AccountTriggerHandler {
             public static void updateIndustryRating(List<Account>
                  accList,Map<Id,Account> oldMap){ for(Account
                  acc:accList){ if((oldMap==null &&acc.Industry==’Media’)
                            || (acc.Industry==’Media’ && acc.Industry != oldMap.get(acc.Id).Industry)){
                            acc.Rating=’Hot’;
                      }
            }
      }
}