sql - MySQL SUM calculation not based on number of rows but based on unique results -


i have query below:

select count(c.status) num,        sum(p.total_paid_nocred) lordo,        sum(p.total_paid) netto     coupons c,         payments p,         addresses     p.payment_id=c.payment_id ,          c.address_id=a.address_id ,          c.offer_id='.$off['offer_id'].' ,           c.address_id!=0 ,          a.time <= '.$off['insertion_date'].' ,           c.user_id!=0 ,           c.status in (1,2) ,          a.shipment_num="" ,          p.status=0 ,          p.medium!=3

the problem having when query runs can find example 5 coupons, divided between 3 different payment transactions , other 2 of them in 1 transaction.

to clear. client can buy 3 different coupons 3 different transactions, or can buy 2 coupons on 1 single transaction.

so when query sum, if single transaction has 2 linked coupons duplicates amount of transaction 2. not good, because transaction amount final is, not have duplicated more times many coupons linked transaction.

i trying use group p.payment_id doing break rest of code working on query.

how can force sum unique transaction sum functions , leave rest is?

thanks help!


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