larvel migration reference keys code example
Example 1: foreign key laravel migration
$table->foreign('column_name')->references('id')->on('table_name')->onDelete('cascade');
Example 2: laravel 8 foreign key migration
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
Schema::table('posts', function (Blueprint $table) {
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users');
});