php - Select from 3 tables with calculating -


i try make query in mysql gets data 3 tables, , calculate in 2 tables. don't know how this.

i have in php code calculate "avage cost per click":

  1. get campaigns.

      select * campaigns;

  2. get how many clicks campaign has:

    select sum(id) ialt2 aktivitet annonce_id = '@@campaign_id' group ip");

  3. get total revenure rows

    select sum(price) ialt money ad = '@@campaign_id' group id

now can calculate "avage cost per click"

 "ialt / ialt2" = cpc

then should say:

select * campaign order cpc desc limit 0,1 

select * campaigns c order (     (select sum(price) money ad = c.campaign_id)     /     (select sum(id) aktivitet annonce_id = c.campaign_id) )desc limit 0,1

just guessing, think want this


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