Calculate moving averages in SQL

Question

I want to calculate a 12 month moving average from a MySQL column. The data represents time-series power measurements, it is a largish dataset (every 10 minutes for several

Answer 1

Try:

SELECT YEAR(GDTE) AS year, 
       MONTH(GDTE) AS month, 
       SUM(case when i=0 then Active end)/6 as total,
       SUM(Active)/(MAX(i+1)*6) as avg
FROM
(select s.*, DATE_ADD(DTE, INTERVAL m.i MONTH) GDTE, m.i
 FROM saturne s
 cross join (select 0 i union select 1 union select 2 union select 3 union 
             select 4 union select 5 union select 6 union select 7 union 
             select 8 union select 9 union select 10 union select 11) m
) sq
WHERE GDTE <= curdate()
GROUP BY YEAR(GDTE), MONTH(GDTE)