我可以在所有的日子里使用唯一的用户，但是如果我输入某一天，那么我会得到一个空数组。

$query = $this->createQueryBuilder('a')
        ->leftJoin('a.event', 'e')
        ->leftJoin('a.customer', 'c')
        ->select('count(date_format(a.date, \'%Y %m %d\'))')
        ->where('e.id = :id')
        ->andWhere('a.page = :page')
        ->andWhere('c.status = :customer')
        ->setParameter('id', $event)
        ->setParameter('page', $page)
        ->setParameter('customer', $customer)
        ->groupBy('c.id')
        ->having('count(distinct date_format(a.date, \'%Y %m %d\')) > 1');

    if ($date != '') {
        $query = $query
            ->andWhere('date_format(a.date, \'%m/%d/%Y\') = :date')
            ->setParameter('date', $date);
    }
    $query = $query->getQuery()->getResult();