案例語句的WHERE子句

Question

我使用一個查詢來獲取結果的GridView

SELECT DISTINCT 
    Order_Header.Id, Order_Header.Payment_Id, Order_Header.Order_No 
FROM 
    Order_Header 
INNER JOIN 
    Order_Shipping_Detail ON Order_Header.Id = Order_Shipping_Detail.Order_Id 
LEFT OUTER JOIN 
    cod_orders ON cod_orders.Order_Id = Order_Header.Id 
WHERE 
    Status = 2 

不過，我需要返回所有的訂單，其中狀態= 2和訂單，其中付款編號是鱈魚（也狀態= 2 ）和cod_orders.Is_confirmed = 1。

我可以爲此使用CASE語句嗎？

但是，如果我嘗試這樣做，我正在實現我的結果。

SELECT DISTINCT Order_Header.Id, order_Header.Payment_Method_Id,Order_Header.Order_No 
FROM Order_Header INNER JOIN Order_Shipping_Detail 
ON Order_Header.Id = Order_Shipping_Detail.Order_Id 
LEFT JOIN cod_orders 
ON cod_orders.Order_Id = Order_Header.Id 
WHERE Status = 2 and Payment_Method_Id != 6 
UNION 
Select DISTINCT Order_Header.Id, order_Header.Payment_Method_Id,Order_Header.Order_No 
FROM Order_Header INNER JOIN Order_Shipping_Detail 
ON Order_Header.Id = Order_Shipping_Detail.Order_Id 
LEFT JOIN cod_orders 
ON cod_orders.Order_Id = Order_Header.Id 
WHERE Status = 2 AND cod_orders.Is_Confirmed = 1 

我可以將它們合併爲一個查詢嗎？

Answer 1

我想你可以合併2個條件是這樣

SELECT DISTINCT Order_Header.Id, Order_Header.Payment_Id,Order_Header.Order_No 
FROM Order_Header INNER JOIN 
    Order_Shipping_Detail 
    ON Order_Header.Id = Order_Shipping_Detail.Order_Id LEFT OUTER JOIN 
    cod_orders 
    ON cod_orders.Order_Id = Order_Header.Id 
WHERE Status = 2 and (Payment_Method_Id != 6 or cod_orders.Is_confirmed = 1)