Running a query multiple times inside foreach loop and storing the results in an array.

Hello Everyone, I have encountered a strange problem. I am trying to run a query multiple times with foreach loop and storing the results in an array to use later for some calculations.

Below is the detail:

This works

$test = DB::table('appcal')
                    ->select('monthyear','appdate')
                    ->whereDate('appdate','>=', '2018-04-01')
                    ->get();

        dd($test);

But this does not work

foreach($activities as $activity){
            $qry[] = DB::table('appcal')
                    ->select('monthyear','appdate')
                    ->whereDate('appdate','>=', '2018-04-01')
                    ->get(); 
        }
            dd($qry);

But this work

foreach($activities as $activity){
            $qry[] = DB::table('appcal')
                    ->select('monthyear','appdate')
                    ->whereDate('appdate','=', '2018-04-01')
                    ->get(); 
        }
            dd($qry);

Can you suggest what is the issue here? Am I doing something wrong ?

What should I correctly do to store the query results in an array to use later for some calculations.