How can I get max, min & average (hours with minutes) of fast 30 days data

Question

Table name:
run_log
TYPE VARCHAR2(10),
SUBTYPE VARCHAR2(10),
PROGRAM VARCHAR2(100),
STATUS VARCHAR2(20),
START_TIME      DATE,
END_TIME      DATE
How can I get max, min & average (hours with minutes) of fast 30 days data ?

Answer 1

Hi,
you have to use analytical functions:
SELECT start_day,
       round(AVG(daily_avg)
             over(ORDER BY start_day ASC RANGE BETWEEN INTERVAL '30' DAY preceding AND INTERVAL '0' DAY following)) AS moving_avg,
       round(MAX(daily_max)
             over(ORDER BY start_day ASC RANGE BETWEEN INTERVAL '30' DAY preceding AND INTERVAL '0' DAY following)) AS moving_max,
       round(MIN(daily_min)
             over(ORDER BY start_day ASC RANGE BETWEEN INTERVAL '30' DAY preceding AND INTERVAL '0' DAY following)) AS moving_min
  FROM (SELECT trunc(t.start_time) start_day,
               AVG((t.end_time - t.start_time) * 24 * 60 * 60) AS daily_avg,
               MAX((t.end_time - t.start_time) * 24 * 60 * 60) AS daily_max,
               MIN((t.end_time - t.start_time) * 24 * 60 * 60) AS daily_min
          FROM run_log
         GROUP BY trunc(t.start_time)) t
ORDER BY 1 DESCAnalytical functions are described in the Oracle doc "Data Warehousing Guide".
Regards,
Carsten.