php - Calculate the 5-day moving average - Set value to 0 if there is a gap between dates. -


i'm trying calculate 5-day moving average. , works fine, except when there gap between dates. when there gap, value missing date(-s) should set 0 show correct moving average.

here table (orders_total) , can see there no date 1/7/13 , causing problem:

orders_id    value    date 1            199      1/1/13 0:00 2            199      1/2/13 0:00 3            199      1/3/13 0:00 4            199      1/4/13 0:00 5            249      1/5/13 0:00 6            199      1/6/13 0:00 7            199      1/8/13 0:00 8            199      1/9/13 0:00 9            199      1/10/13 0:00 10           199      1/11/13 0:00 11           199      1/12/13 0:00 12           199      1/13/13 0:00

if value missing date 1/7/13 set zero, correct 5-day moving average (that 'm looking for) is:

199 199 199 199 209 209 169.2 169.2 169.2 159.2 159.2 199 199

this code i'm using, , not showing correct moving average when there gap between dates:

    select ot1.value, ot1.date,     (select sum(ot2.value) / count(ot2.value)     orders_total ot2 datediff(ot1.date, ot2.date) between 0 , 4) '5daymovingavg'     orders_total ot1 order ot1.date";

if know 5 days, why divide count(ot2.value)? unless you're trying handle edge cases, in case, handle edge cases differently normal case.


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