mysql - sql select top 5 every month -


i have mysql table of format, let's call product_revenue product_id, year, month, revenue

and need following columns: year, month, revenue_top_5_monthly

where revenue_top_5_monthly sum of revenue of products had highest revenue in month. top 5 products vary month month.

i can single month selecting sub-query single month, sorting revenue , using limit 5, summing value, wouldn't know how every month in single query

what have is

select 'y' year, 'x' month, sum(revenue) revenue_top_5 (select revenue product_revenue month=x , year=y order revenue desc limit 5) top5

but need every month in 1 shot.

the product_revenue table has on 10m rows 16 months, final query speed of large relevance. 1 month takes 80-100 sec, , have run 30 such queries, each whole 16 months, in 1h 30min slot.

as suggested, tried

select * ( select dd.year, dd.monthnumber, u.product_id, sum(revenue) revenue source group 1,2,3 )a  (select count(*)                             (select dd.year, dd.monthnumber,                             u.product_id, sum(revenue) revenue                             source                             group 1,2,3)b b.year=a.year , b.monthnumber=a.monthnumber , b.revenue<=a.revenue )<=5

but returns no rows. individual subqueries , b return expected rows named.

try query

select * (select  @rn:=if(@prv=product_id, @rn+1, 1) rid, @prv:=product_id product_id, year,  month, revenue tbl join (select @prv:=0, @rn:=0)tmp order  product_id, revenue desc) rid<=5

sql fiddle:

| rid | product_id | year | month | revenue | --------------------------------------------- |   1 |          1 | 2013 |     1 |     100 | |   2 |          1 | 2013 |     1 |      90 | |   3 |          1 | 2013 |     1 |      70 | |   4 |          1 | 2013 |     1 |      60 | |   5 |          1 | 2013 |     1 |      50 | |   1 |          2 | 2013 |     1 |    5550 | |   2 |          2 | 2013 |     1 |     550 | |   3 |          2 | 2013 |     1 |     520 | |   4 |          2 | 2013 |     1 |     510 | |   5 |          2 | 2013 |     1 |     150 |

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