### delete
刪除表中的數據
delete($table, $where)
* ##### table [string]
表名.
* ##### where [array]
WHERE 刪除條件.
Return: [number] 返回被刪除的行數.
一個比較危險的操作，操作前請考慮好。。。
~~~
$database->delete("account", [
"AND" => [
"type" => "business"
"age[<]" => 18
]
]);
~~~
