Full Outer Join查询接收错误

Question

有一个简单的mysql查询收到错误消息。

这是查询：

$query_parts = "SELECT I.sku, I.orderID, P.sku, P.description FROM inventory I FULL OUTER JOIN parts P ON I.sku = P.sku WHERE I.orderID = $orderID";

这是错误：

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'FULL OUTER JOIN parts P ON I.sku = P.sku WHERE I.orderID = 4881166' at line 1

请帮助，对我来说，它看起来非常直接。