AS多個選擇

Question

是否可以在多個選擇中使用AS？ 類似：

SELECT O.order_id, Sum(Order_Tot) FROM 
(SELECT P.price * O.qty as Order_Tot FROM crOrdersToProducts O 
JOIN tblProducts P ON O.style_id = P.id) 
GROUP BY O.order_id 

試圖使用一個查詢的訂單ID顯示訂單總數。

Answer 1

//try this query 

SELECT OT.order_id, Sum(OT.Order_Tot) FROM 
(SELECT O.order_id,P.price * O.qty as Order_Tot FROM crOrdersToProducts O 
JOIN tblProducts P ON O.style_id = P.id) as OT 
GROUP BY OT.order_id