php - how to aggregate data by age for rows spanning across different timeline -

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i have huge table on 10,00,000 rows , growing. data looks this

id     topic_id      publish_date            hits ------------------------------------------------- 1        1          2014-01-01               20 2        1          2014-01-01               10 3        1          2014-01-03               10 4        2          2014-01-10               50 5        2          2014-01-15              100 ... ...

i have table topics id, name, start_date, end_date.

i need retrieve hit data table daywise hits each topic. enable me compare performance on each day

eg:

topic ->            1            2 day 1                   x            y 2                   y            3                   z            b

so on.

i hope made proper explanation.

what trying is:

select report.topic_id, topic.start_date,  sum(if( datediff(report.hits , en.start_date) = 0, hit,0)) d0 ,sum(if( datediff(report.hits , en.start_date) = 1, hit,0)) d1 ,sum(if( datediff(report.hits , en.start_date) = 2, hit,0)) d2 ,sum(if( datediff(report.hits , en.start_date) = 3, hit,0)) d3 ,sum(if( datediff(report.hits , en.start_date) = 4, hit,0)) d4 ,sum(if( datediff(report.hits , en.start_date) = 5, hit,0)) d5 report left join topic en on report.topic_id = en.id topic_id in (1,2,4) group topic_id

it takes 10-12 seconds generate result data. using php & mysql. willing tradeoff taking off db load script calculation, caching results.

is there better way this? looking @ faster way retrieve results.


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