Doctrine 2, count when left join

问题

I have this:

->select('COUNT(x)')->setMaxResults(null)->setFirstResult(0)->getQuery()->getSingleScalarResult();

this works as long as I dont have join. If I have left join, it will also count the duplicated left-columns. How to prevent that?

回答1:

You can do that by grouping:

$qb->select('COUNT(x)')
   ->leftJoin('x.another_table', 'a')
   ->groupBy('x.id')
   ->setMaxResults(null)
   ->setFirstResult(0)
   ->getQuery()
   ->getSingleScalarResult();

来源：https://stackoverflow.com/questions/36296138/doctrine-2-count-when-left-join