making code for inscription cas sensitive when checking against existence

database/migrations/2021_07_20_141844_create_salaries_table.php

@@ -20,10 +20,12 @@ class CreateSalariesTable extends Migration
             $table->string('matricule');
             $table->string('nom')->nullable();
             $table->string('prenom')->nullable();
-            $table->string('code')->nullable();
+            //$table->string('code')->nullable();
 
             $table->timestamps();
         });
+
+        DB::statement('ALTER TABLE `salaries` ADD `code` VARBINARY(50) AFTER `prenom`');
     }
 
     /**