Query to calculate TV Events ( Agregate function?)

Question

Dear All,
I have a table of scheduled TV Events. In my case it is legal to broadcast some event again and again during 48 hours since it was aired first time, without paying extra fees.
I need to count across all the broacasting days how many times the Event was aired to be able to know what fees I shall pay.
A quick example:
Case 1
Programme "Lost" Episode 1 was aired first on Jan/1/2008 at 8:00am. I can broadcast it as many times as I want until Jan/3/2008, 07:59am and it will be counted as one Event only.
Case 2
Programme "Lost" Episode 1 was aired first on Jan/1/2008 at 8:00am and the same Episode 1 was aired a second time on Jan/3/2008 at 10:00am. Here I must pay fees as it was aired twice. I need to count it as 2
Many thanks in advance!

Answer 1

Hi,
Assuming 10g with OLAP option installed.
My test data structure:
Event_Id - a program, i.e "Lost", etc
Event_DT - a date and time when program was aired
SQL> WITH Test_Data AS (
  2    SELECT 1 AS Event_Id, TO_DATE('01.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  3    SELECT 1 AS Event_Id, TO_DATE('01.01.2008 09:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  4    SELECT 1 AS Event_Id, TO_DATE('02.01.2008 18:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  5    SELECT 1 AS Event_Id, TO_DATE('03.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  6    SELECT 1 AS Event_Id, TO_DATE('04.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  7    SELECT 1 AS Event_Id, TO_DATE('05.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  8    SELECT 2 AS Event_Id, TO_DATE('01.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
  9    SELECT 2 AS Event_Id, TO_DATE('01.01.2008 09:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
10    SELECT 2 AS Event_Id, TO_DATE('02.01.2008 18:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
11    SELECT 2 AS Event_Id, TO_DATE('03.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
12    SELECT 3 AS Event_Id, TO_DATE('04.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual UNION ALL
13    SELECT 3 AS Event_Id, TO_DATE('05.01.2008 08:00:00', 'DD.MM.YYYY HH24:MI:SS') AS Event_DT FROM Dual
14  ),
15  RNs AS (
16    SELECT Test_Data.*,
17      ROW_NUMBER() OVER (PARTITION BY Event_Id ORDER BY Event_DT) AS RN
18    FROM Test_Data
19  ),
20  Event_Starts AS (
21    SELECT Event_Id, Event_DT, RN, Event_Start
22    FROM RNs
23    MODEL
24      PARTITION BY (Event_Id)
25      DIMENSION BY (RN)
26      MEASURES (Event_DT, Event_DT Event_Start)
27      RULES (
28        Event_Start[ANY ] ORDER BY RN = CASE
29                                          WHEN Event_Start[CV() - 1] IS PRESENT
30                                            AND Event_Start[CV()] - Event_Start[CV() - 1] < 2
31                                            THEN Event_Start[CV() - 1]
32                                          ELSE
33                                            Event_DT[CV()]
34                                        END
35      )
36  )
37  SELECT Event_Id, COUNT(DISTINCT Event_Start) Event_Count
38  FROM Event_Starts
39  GROUP BY Event_Id
40  ;
  EVENT_ID EVENT_COUNT
         1           3
         2           2
         3           1Regards,
Dima