laravel check if table has column
if (Schema::hasTable('users')) {
// The "users" table exists...
}
if (Schema::hasColumn('users', 'email')) {
// The "users" table exists and has an "email" column...
}
check if column has value in laravel eloquent
->where(function ($query) {
$query->whereNull('exam_ends_at')
->orWhere('exam_ends_at', '>', Carbon::now());
})