global Database.QueryLocator start(Database.BatchableContext BC) {
        return Database.getQueryLocator('SELECT CITY_NAME__c,PROVINCE_CODE__c,STATUS__c,INTERNET_SERVICE__c,VIDEO_SERVICE__c,PHONE_SERVICE__c FROM MDU_Squad_Data_min__c');
    }
 
   // Execute method

    global void execute(Database.BatchableContext BC, List<MDU_Squad_Data_min__c> cityStats) {               
        // Here I am trying to filter the values of the cityStats list
    }