Multiple mysql joins causing issue with query -

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i'm using following query filter , score results assigned categories working right now. however, if try join, able factor in tag matches scoring, run in issue lots of results returned aren't assigned 3 categories.

here's working query...

        select distinct results.*,                     (                          3*(match(body) against('*' in boolean mode)) +                          5*(match(title) against('*' in boolean mode)) +                          1*usefulness +                          30*(match(body) against('""' in boolean mode)) +                          20*(match(title) against('""' in boolean mode)) +                          5*shares                      ) score          results         inner join categories c on results.id = c.result_id         c.name in ('refinance', 'condo', 'usda')         , ( results.scope = 'all' or results.scope = 'hi' )         , published = 1          group results.id         having count(c.c_id) = 3         order score desc          limit 8 offset 0

adding following line below categories results, what's giving me problems

inner join tags on results.id = tags.result_id

it's if following line stops working when add 2nd join

having count(c.c_id) = 3

i'm @ loss here , appreciated!

the count() failing because have multiple rows in new join matching original data. count() counts non-null values. so, if there 2 matches per id, you'll 6 rows -- , count of 6.

i think following fix problem:

having count(distinct c.c_id) = 3

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