Search code examples
mysqlsqlvariableswhere-clauseuser-defined

mysql using user-defined variable in where clause

sql query:

select
    u.username,
        @total_subscribers:=(
            select count(s.id)
                from subscribers as s
                where s.suid = u.uid
        ) as total_subscribers
from users as u
where @total_subscribers > 0

if i remove where @total_subscribers > 0 query will show all users and their total subscribers

but i want to show only those users who have at least 1 subscriber... after i add the where clause and use the defined variable i get an empty result set.

Solution

  • You can do it with group by and having:

    select
   u.username,
   count(s.id) as total_subscribers
from users as u
inner join subscribers as s on s.suid = u.uid
group by u.id
having count(s.id) > 0