Question

我想为DQL写下这句话：

SELECT id FROM `article` WHERE `created_at` IN (select max(created_at) from article)

我尝试了这个，但是我有一些错误：

return $this->createQueryBuilder('p')
            ->select('p.id')
            ->where('p.createdAt IN (select max(p.createdAt)from p)')
            ->getQuery()
            ->getResult();

错误：

[Semantical Error] line 0, col 88 near 'p)': Error: Class 'p' is not defined.

非常感谢， ibynmax

Answer 1

您还需要在查询构建器中写出子查询：

$subQuery = $this->createQueryBuilder('p')
    ->select('max(p.createdAt)');

$queryBuilder = $this->createQueryBuilder('p');

return $queryBuilder
    ->select('p.id')
    ->where($queryBuilder->expr()->in('p.createdAt', $subQuery->getDQL()))
    ->getQuery()
    ->getResult();

如何在SQL中编写普通句子

1 个答案: