function genTable(\Amp\Mysql\Pool $db)
{
(yield $db->query("CREATE TABLE tmp SELECT 1 AS a, 2 AS b"));
$promises = [];
foreach (range(1, 5) as $num) {
$promises[] = $db->query("INSERT INTO tmp (a, b) VALUES ({$num}, {$num} * 2)");
}
(yield \Amp\all($promises));
}