SQL命令未在Laravel 5.7中给出预期的结果。 我是否需要修改我的表格或查询？

I have my table data like below photo.

My expected data should be like this below photo.

My implemented laravel SQL code is like below.

$img = DB::table('table_name')
->select('table_name.user_id','table_name.post_id','table_name.name')
->groupBy('table_name.user_id')
->get();

This is how I'd do it. This way it's cleaner and working for me.

$img = DB::table('table_name')->select('user_id','post_id','name')
                              ->groupBy('post_id')
                              ->get();

$img = DB::table('table_name')
 ->select('user_id','post_id','name')
 ->groupBy('post_id')
 ->get();

If you're running into this SQLSTATE[42000]: Syntax error or access violation: 1055 error be sure to check that the groupBy parameter is a valid column on the table