How to write this query using Laravel query builder? - php

Question

I'm new to laravel. Here is my query that filters out the quizes that don't have any problem (questions) or the problems don't have any answers. but I'm not sure how to write it properly using laravel query builder. Considering I'm using eloquent to build relationships Would be even better if I could get the same result using laravel eloquent.
SELECT DISTINCT q.id, q.content
FROM m_quiz q
RIGHT JOIN (SELECT DISTINCT p.quiz_id as id
FROM m_problem p
RIGHT JOIN m_answer_choice a
ON p.id = a.problem_id) problem
ON q.id = problem.id
ORDER BY q.id;

Answer 1

Not tested but I think it would be something like this.
DB::table('problems')->selectRaw('m_problem.*, DISTINCT m_problem.quiz_id as id')
->join('m_answer_choice', 'm_problem.id', '=', 'm_answer_choice.problem_id')
->groupBy('m_problem.id')
->get();
But it would be better if you can do something like
namespace App;
use Illuminate\Database\Eloquent\Model;
class Problem extends Model
{
/**
* Get the comments for the blog post.
*/
public function answerChoices()
{
return $this->hasMany('App\AnswerChoices');
}
}
and do something like
$answerChoices= App\Problem::find(1)->answerChoices;
foreach ($answerChoices as $answerChoice) {
//
}

Answer 2

SELECT
*, SUM(num_hr) AS total_hr, attendances.empID AS empid
FROM attendances
LEFT JOIN addsalaryemployees ON addsalaryemployees.empID=attendances.empID
LEFT JOIN positions ON positions.id=addsalaryemployees.empPosition
GROUP BY attendances.empID
ORDER BY addsalaryemployees.empFirstName ASC