mysql 一对多 合并多个通过 逗号拼接展示

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SELECTuser_id,project_id,GROUP_CONCAT(project_specs_id) AS merged_specs_ids
FROMzt_medication_specs_total
WHEREspecs_num_total < 5
GROUP BYuser_id, project_id;

laravel model 对应写法

        return $this->select('user_id', 'project_id')->selectRaw('GROUP_CONCAT(project_specs_id) AS merged_specs_ids')->where('specs_num_total', '<', 5)->groupBy('user_id', 'project_id')->get();}