exchange-2.0/database/migrations/2020_10_22_071120_create_contacts_table.php

<?php

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

class CreateContactsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('contacts', function (Blueprint $table) {
            $table->id();
            $table->bigInteger('country_id')->unsigned()->nullable();
            $table->foreign('country_id')->references('id')->on('countries')->onDelete('cascade');
            $table->bigInteger('company_id')->unsigned()->nullable();
            $table->foreign('company_id')->references('id')->on('companies')->onDelete('cascade');
            $table->string('reference')->nullable();
            $table->string('phone')->nullable();
            $table->string('email')->nullable();
            $table->string('wechat_id')->nullable();
            $table->timestamps();
        });
    }

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