Question

我想获取订单状态，其中状态记录在单独的表“ order_status_change”中。使用以下脚本，我可以获取所有记录，但不能获取最新状态。（最大（状态更改日期）的order_item_ID需要状态。

 SET @UserID = 160;
    SET @OrderDateTime = '2018-11-13 09:23:45';

    SELECT 
order_items.ORDER_ITEM_ID,
order_price.ORDER_ITEM_TOTAL_PRICE,
order_status_change.ORDER_STATUS

FROM order_items 

INNER JOIN order_price ON order_price.ORDERP_ITEM_ID = order_items.ORDER_ITEM_ID

INNER JOIN order_status_change ON order_status_change.ORDER_ITEM_ID = order_items.ORDER_ITEM_ID

WHERE ((SELECT A.A_User_ID from A WHERE A.A_USER_ID = @UserID) AND (DATE(order_items.ORDER_REQUIRED_DATE_TIME) = DATE(@OrderDateTime)))

如果我使用Max（order_status_change.STATUS_CHANGE_DATE），那么我只会得到一条记录。我通过在这里查看其他示例来修改查询，但是没有用。

SELECT 
order_items.ORDER_ITEM_ID,
order_price.ORDER_ITEM_TOTAL_PRICE,
order_status_change.ORDER_STATUS

FROM order_items 

INNER JOIN order_price ON order_price.ORDERP_ITEM_ID = order_items.ORDER_ITEM_ID

INNER JOIN 
(SELECT MAX(order_status_change.ORDER_STATUS_CHANGE_DATETIME) AS STATUS_CHANGED_DATE FROM order_status_change WHERE order_status_change.ORDER_ITEM_ID = order_items.ORDER_ITEM_ID) 
AS order_status_change ON order_status_change.ORDER_ITEM_ID = order_items.ORDER_ITEM_ID

WHERE ((SELECT A.A_User_ID from A WHERE A.A_User_ID = @UserID) AND (DATE(order_items.ORDER_REQUIRED_DATE_TIME) = DATE(@OrderDateTime)))

如何获取每个order_items.ORDER_ITEM_ID的“最新” order_status_change.STATUS？

Answer 1

您可以尝试一下。

SELECT 
    order_items.ORDER_ITEM_ID,
    order_price.ORDER_ITEM_TOTAL_PRICE,
    order_status_change.ORDER_STATUS
FROM order_items 
INNER JOIN order_price ON order_price.ORDERP_ITEM_ID = order_items.ORDER_ITEM_ID
INNER JOIN 
(
    SELECT MAX(order_status_change.ORDER_STATUS_CHANGE_DATETIME) AS STATUS_CHANGED_DATE,ORDER_ITEM_ID
    FROM order_status_change 
    GROUP BY ORDER_ITEM_ID
) AS order_status_change ON order_status_change.ORDER_ITEM_ID = order_items.ORDER_ITEM_ID
WHERE (
    (DATE(order_items.ORDER_REQUIRED_DATE_TIME) = DATE(@OrderDateTime))
)

如何在INNER JOIN语句中获取MAX日期

1 个答案: