private String getTupleID(String tableName, List<String> keyVals){
		List<TupleIDMap> tim = tableDataIDs.get(tableName);
		for(int i=0; i<tim.size(); i++){
			TupleIDMap currIDMap = tim.get(i);
			if(currIDMap.isPKValsSame(keyVals)){
				return currIDMap.getID();
			}
		}
		return "";
	}