php - LARAVEL MYSQL 如何使用自然 JOIN

Question

我需要在集合中返回来分页，但我只能在数组中返回，因为查询使用自然联接。 我如何使用 Laravel 集合执行此查询:

SELECT mensagens.* FROM mensagens NATURAL JOIN ( SELECT id_emissor, MAX(created_at) created_at FROM mensagens WHERE id_receptor = ".$user_id." GROUP BY id_emissor) t

我使用了这段代码:

$mensagem = \DB::select( DB::raw("SELECT mensagens.* FROM mensagens NATURAL JOIN ( SELECT id_emissor, MAX(created_at) created_at FROM mensagens WHERE id_receptor = ".$user_id." GROUP BY id_emissor) t ") );

Answer 1

如果您想按原样使用查询，请像这样使用 -

\DB::raw("SELECT mensagens.* FROM mensagens NATURAL JOIN ( SELECT id_emissor, MAX(created_at) created_at FROM mensagens WHERE id_receptor = ".$user_id." GROUP BY id_emissor) t");

否则你也可以使用 eloquent。