doubt in query - mysql -


i trying query

select round( avg( datediff( current_date, age ) /365 ) , 1 ) single_user u inner join university_has_single_user t  on t.single_user_users_id_user = u.users_id_user ( select id_university university university = "isel" ) limit 0 , 30

the output 26.8 there problem because if change name of university or remove clause result 26.8 again.

the dates are:

1979-06-23 1988-04-23 1988-04-23.

any help? problem?

where ( select id_university university university = "isel" )

should be

where   exists (   select id_university   university x   x.university = "isel" ,     x.universityid = t.universityid   )

well, guess. it's not clear me wat table structure is, , you're trying achieve, seems me want number given university, passing name query.

if i'm wrong there, please post table structure , actual goal.


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