exchange/database/migrations/2018_07_21_102920_create_notification_table.php

<?php

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

class CreateNotificationTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('notifications', function (Blueprint $table) {
            $table->increments('id');
            $table->string('detail');
            $table->string('link');
            $table->unsignedInteger('user_id');
            $table->boolean('is_read')->default(0);
            $table->timestamps();

            $table->foreign('user_id')
                    ->references('id')->on('users')
                    ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('notifications');
    }
}