baoshi-was/database/migrations/2020_04_09_111540_change_tutorial_table.php

<?php

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

class ChangeTutorialTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('tutorials', function (Blueprint $table) {
            $table->dropColumn('content');
        });
        Schema::table('users', function (Blueprint $table) {
            $table->string('email')->nullable()->change();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('tutorials', function (Blueprint $table) {
            $table->longText('content')->after('name')->nullable()->comment('富文本内容');
        });
        Schema::table('users', function (Blueprint $table) {
//            $table->unique('email','users_email_unique');
//            $table->string('email')->unique()->change();
        });
    }
}