update

app/Http/Controllers/Admin/CourseSignController.php

@@ -86,7 +86,9 @@ class CourseSignController extends BaseController
                 $query->where('is_vip', $all['is_vip']);
             }
             if (isset($all['company_name'])) {
-                $query->where('company_name', 'like', '%' . $all['company_name'] . '%');
+                $query->whereHas('company', function ($query) use ($all) {
+                    $query->where('company_name', 'like', '%' . $all['company_name'] . '%');
+                });
             }
             if (isset($all['company_position'])) {
                 $query->where('company_position', $all['company_position']);