one mysql query getting, per each row, the average of the previous three rows -



one mysql query getting, per each row, the average of the previous three rows -

i have this:

id | value --------------- 201311 | 10 201312 | 15 201401 | 20 201402 | 5 201403 | 17

and need result this:

201311 | null or 0 201312 | 3.3 // 10/3 201401 | 8.3 // (15+10)/3 201402 | 15 // (20+15+10)/3 201403 | 13.3 // (5+20+15)/3

so far, got point can avg of lastly 3 previous rows this:

select avg(c.value) (select b.value table b b.id < 201401 order b.id desc limit 3) c

passing id manually. i'm not able each id.

any ideas much appreciated!

thanks lot.

regards

i think you'll have write stored procedure, utilize cursor, iterate through table , populate new table using values calculated in cursor loop. if need help writing out cursor loop, drop comment , can example.

mysql

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