Number of active connections to given time

I have this data:
WITH t AS
  (SELECT to_date('01/31/2013 08:31:00','MM/DD/YYYY HH24:MI:SS') logon_time,
    to_date('01/31/2013 08:39:00','MM/DD/YYYY HH24:MI:SS') logoff_time
  FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:31:00','MM/DD/YYYY HH24:MI:SS') logon_time,
    to_date('01/31/2013 08:33:00','MM/DD/YYYY HH24:MI:SS') logoff_time
  FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS') logon_time,
    to_date('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS') logoff_time
  FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS') logon_time,
    to_date('01/31/2013 08:34:00','MM/DD/YYYY HH24:MI:SS') logoff_time
  FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:39:00','MM/DD/YYYY HH24:MI:SS') logon_time,
    to_date('01/31/2013 08:41:00','MM/DD/YYYY HH24:MI:SS') logoff_time
  FROM dual
  ) ,
  u AS
  ( SELECT to_date('01/31/2013 08:31:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:33:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:34:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:35:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:36:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:37:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:38:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  UNION ALL
  SELECT to_date('01/31/2013 08:39:00','MM/DD/YYYY HH24:MI:SS') ztime FROM dual
  )
  SELECT * FROM t RIGHT JOIN u ON t.logon_time = u.ztime ORDER BY ztime;
And I would like to know how many connections are active for any given ztime. Pseudo-device code I thought was:
ztime, count where logon_time = ztime or ( logon_time < ztime and logoff_time >= ztime )
The results of the above might look like:
zTime               Logon_Count
01/31/2013 08:31:00 2
01/31/2013 08:32:00 4
01/31/2013 08:33:00 3
01/31/2013 08:34:00 2
01/31/2013 08:35:00 1
01/31/2013 08:36:00 1
01/31/2013 08:37:00 1
01/31/2013 08:38:00 1
01/31/2013 08:39:00 2

Try this...

WITH t AS
     (SELECT TO_DATE ('01/31/2013 08:31:00','MM/DD/YYYY HH24:MI:SS') logon_time,
             TO_DATE ('01/31/2013 08:39:00', 'MM/DD/YYYY HH24:MI:SS') logoff_time
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:31:00','MM/DD/YYYY HH24:MI:SS') logon_time,
             TO_DATE ('01/31/2013 08:33:00','MM/DD/YYYY HH24:MI:SS') logoff_time
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS' ) logon_time,
             TO_DATE ('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS') logoff_time
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:32:00','MM/DD/YYYY HH24:MI:SS') logon_time,
             TO_DATE ('01/31/2013 08:34:00','MM/DD/YYYY HH24:MI:SS') logoff_time
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:39:00','MM/DD/YYYY HH24:MI:SS') logon_time,
             TO_DATE ('01/31/2013 08:41:00','MM/DD/YYYY HH24:MI:SS') logoff_time
        FROM DUAL),
     u AS
     (SELECT TO_DATE ('01/31/2013 08:31:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:32:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:33:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:34:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:35:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:36:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:37:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:38:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL
      UNION ALL
      SELECT TO_DATE ('01/31/2013 08:39:00', 'MM/DD/YYYY HH24:MI:SS') ztime
        FROM DUAL)
SELECT   u.ztime, COUNT (*) logon_count
    FROM t, u
   WHERE u.ztime BETWEEN logon_time AND logoff_time
GROUP BY u.ztime
ORDER BY u.ztime

Tags: Database

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