public function up()
{
Schema::table(‘users’, function (Blueprint $table) {
$table->string(‘avatar’, 100);
});
}
新增avatar字段，然后运行php artisan migrate ，小黑窗报错：
In Connection.php line 664:
SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for ‘up
dated_at’ (SQL: alter table users add avatar varchar(100) not null)

In Connection.php line 458:
SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'up
dated_at’
这个是哪里的问题？