FieldInSOQLChangesResults.java

List<Case> c = [SELECT Id, isDeleted FROM Case WHERE Id = '500C000000VlnSsIAJ'];
system.debug(c.size()); //1

//Formula field
c = [SELECT Id, Created_During_Business_Hours__c  FROM Case WHERE Id = '500C000000VlnSsIAJ'];
system.debug(c.size()); //0

//Created_During_Business_Hours__c uses this field in formula
c = [SELECT Id, Actual_Case_Start_Time__c FROM Case WHERE Id = '500C000000VlnSsIAJ'];
system.debug(c.size()); //0

try{
    c = [SELECT Id FROM Case WHERE Id = '500C000000VlnSsIAJ'];
    c[0].Subject = 'WHY WONT YOU WORK';
    update c;
} catch (Exception e){
    system.debug(e);
    //12:25:12:123 EXCEPTION_THROWN [15]|System.DmlException: Update failed. First exception on row 0 with id 500C000000VlnSsIAJ; first error: INSUFFICIENT_ACCESS_OR_READONLY, insufficient access rights on object id: []
}