video_system/database/migrations/2021_04_14_073645_update_users_table.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class UpdateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('users', function (Blueprint $table) {
            $table->dropUnique('users_email_unique');
            $table->string('email')->nullable()->change();
            $table->string('mobile', 16)->nullable()->comment('手机号');
            $table->string('staff_num', 20)->unique()->comment('用户编码');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('users', function (Blueprint $table) {
            //
        });
    }
}