how to use GROUP_CONCAT in laravel

问题

$assignment = assignment::find(Crypt::decrypt($id));
$assignment_details = $assignment->raw_plan()->groupBy('flag')->get();

I want to following result of this query in laravel

SELECT GROUP_CONCAT(name) AS 'names' FROM `raw_plans` where `assignment_id` = 1 GROUP BY`flag`

Please suggest me how to use GROUP_CONCAT in laravel

回答1:

You can use relations as query builder to fetch the results as:

$assignment_details = $assignment->raw_plan()
                                ->select(DB::raw('group_concat(name) as names'))
                                ->where('assignment_id', 1)
                                ->groupBy('flag')
                                ->get();

Update

Use table_name.* in select to get all the fields.

$assignment_details = $assignment->raw_plan()
                                ->select('raw_plans.*', DB::raw('group_concat(name) as names'))
                                ->where('assignment_id', 1)
                                ->groupBy('flag')
                                ->get();

回答2:

shoieb is somewhat right, but you should give table name before accessing column names in DB:raw()

You should try this:

$data = DB::table('raw_plans')
            ->select(DB::raw("group_concat(raw_plans.name)"))
            ->groupBy('flag')
            ->where('assignement_id',1)
            ->get();

Hope this helps.

回答3:

Try with below code

$data = DB::table('raw_plans')
            ->select(DB::raw("GROUP_CONCAT(name SEPARATOR '-') as `names`"))
            ->groupBy('flag')
           ->where('assignement_id',1)
            ->get();

回答4:

Try this

$sql = "SELECT GROUP_CONCAT(name) AS 'names' FROM `raw_plans` where  `assignment_id` = 1 GROUP BY`flag`";

  $info = DB::select(DB::raw($sql));

来源：https://stackoverflow.com/questions/40486296/how-to-use-group-concat-in-laravel