マスター/詳細関係を持つODataシステムで2つのタイプが公開される構造を考えます。
注文
-OrderDetails
How would you filter a query of orders based upon the count of associated OrderDetails? In my head, it's something along the lines of
/Orders$filter=count(OrderDetails) eq 0
But, of course there's no count function. So, how would you produce a list of orders which had no OrderDetails?