Input: atypical cube , drill-through query , similarity threshold
  Output: The approximate result , the precise result
1   foreach basic atypical cluster in cube do
2      if related to Q then add to micro_set;
3 end
4 clustering (Algorithm 1);
5   return ;
6   foreach do
7    drill through to the sensor dataset;
8 filter the records in with ’s condition;
9    add to ;
10  end
11 clustering ;
12  return ;
Algorithm 5: Drill-through query processing.