laravel unique multiple columns
$table->unique(['mytext', 'user_id']);
Source: stackoverflow.com
laravel unique validation on multiple columns
'mobile_no' => 'unique:users,mobile_no,NULL,id,country_id,'.request('country_id');
Laravel Unique Multiple Column validation
'name' => 'required|max:150|unique:course_lessons,name,NULL,id,course_id,' . request('course_id'),