Use results from one sql query in another where statement (subquery?)
Solution 1:
SELECT dfid,count(*)
from downloads_downloads
WHERE dmid IN (
SELECT dmid
FROM downloads_downloads
where dfid = "7024"
)
group by dfid
or using a self join
select t1.dfid,count(*)
from downloads_downloads t1
inner join downloads_downloads t2
on t1.dmid = t2.dmid
where t2.dfid = "7024"
if this takes too long then you will probably need to post an explain plan (google it!)