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# Average of a field between two dates

Update:11-30Source: network consolidation
Hi,
I have a table with two fields. Date Field and Percentage field. For ex,
Date Percentage
1/1/2006 11
1/4/2006 23
2/4/2006 34
11/11/2006 354
1/4/2007 75
10/09/2007 67
2/3/2008 876
I want to find the average(sum of percentage/total no) of Percentage field between two dates.
I am passing only the end date. And, the start date I have to find according to the end date.
For ex,if I am passing the end date as 10/09/2007, starting date should be 1/4/2007.
And, if I am passing the end date as 11/11/2006, starting date should be 1/4/2006.
For end date 2/3/2008, start date should be 1/4/2007.
Starting date is taken as by considering the year end as April to March. So, I have to retrieve the average of the percentage field from April to the selected date as end date.
thanks

Getting the sum, number of rows and average since the last 1st of April to the current date :
SQL> with tbl as
2  (select to_date('01/01/2006','dd/mm/yyyy') as dt, 11  prct from dual union all
3   select to_date('01/04/2006','dd/mm/yyyy') as dt, 23  prct from dual union all
4   select to_date('02/04/2006','dd/mm/yyyy') as dt, 34  prct from dual union all
5   select to_date('11/11/2006','dd/mm/yyyy') as dt, 354 prct from dual union all
6   select to_date('01/04/2007','dd/mm/yyyy') as dt, 75  prct from dual union all
7   select to_date('10/09/2007','dd/mm/yyyy') as dt, 67  prct from dual union all
8   select to_date('02/03/2008','dd/mm/yyyy') as dt, 876 prct from dual)
9  select dt, prct,
10         sum(prct) over (order by dt range between dt-add_months(trunc(add_months(dt,-3),'yyyy'),3) preceding and current row) sum_prct,
11         count(prct) over (order by dt range between dt-add_months(trunc(add_months(dt,-3),'yyyy'),3) preceding and current row) nb_prct,
12         avg(prct) over (order by dt range between dt-add_months(trunc(add_months(dt,-3),'yyyy'),3) preceding and current row) avg_prct
13  from tbl;
DT             PRCT   SUM_PRCT    NB_PRCT   AVG_PRCT
01/01/06         11         11          1         11
01/04/06         23         23          1         23
02/04/06         34         57          2       28,5
11/11/06        354        411          3        137
01/04/07         75         75          1         75
10/09/07         67        142          2         71
02/03/08        876       1018          3 339,333333
7 rows selected.Nicolas.
• Average of a field between two dates Update:11-30

Hi, I have a table with two fields. Date Field and Percentage field. For ex, Date Percentage 1/1/2006 11 1/4/2006 23 2/4/2006 34 11/11/2006 354 1/4/2007 75 10/09/2007 67 2/3/2008 876 I want to find the average(sum of percentage/total no) of Percentag

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