Laravel-使用条件之间的许多表计数记录

Question

function fetch_c(Request $request) {
    if($request->ajax()) {
       if($request->from_date != '' && $request->to_date != '') {
           return $request;
         $data = DB::select("SELECT (SELECT COUNT(*) FROM pos) as a, (SELECT COUNT(*) FROM customers) as b, (SELECT COUNT(*) FROM supplires) as c") 
         ->whereBetween('created_at', array($request->from_date, $request->to_date));
        }
       else {
           $data = DB::select("SELECT (SELECT COUNT(*) FROM pos) as a, (SELECT COUNT(*) FROM customers) as b, (SELECT COUNT(*) FROM supplires) as c");
       }

       echo json_encode($data); 
   }    
}