将SELECT查询结果中的多行更新为同一个表

Question

我想弄清楚如何组合这两个查询。

SELECT `o`.`Order_ID`
FROM `Orders` `o`
JOIN `CustomerDetails` `cd` ON `cd`.`Customer_ID` = `o`.`Customer_ID`
WHERE `o`.`OrderPlaceServerTime` >= '2013-06-01 00:00:00'
AND `o`.`OrderPlaceServerTime` <= '2013-06-31 23:59:59'
AND `cd`.`SalesRep_ID` = 6

这给了我一个Order_ID列表，我需要使用上面的Query中的SalesRep_ID = 6来更新。

从上面的查询中获取Order_ID列表后，我使用...

UPDATE Orders SET SalesRep_ID =  '6'
WHERE  (Order_ID = 541304
OR  Order_ID = 541597
OR  Order_ID = 542318)

这样做会使用正确的SalesRep_ID更新订单。

最后，我想将这些组合起来进行一次查询，我只想更改SalesRep_ID

Answer 1

具有适当UPDATE语法的解决方案，其中包含用于MySql的JOIN

UPDATE Orders o JOIN CustomerDetails d 
    ON d.Customer_ID = o.Customer_ID
   SET o.SalesRep_ID = 6
 WHERE o.OrderPlaceServerTime >= '2013-06-01 00:00:00'
   AND o.OrderPlaceServerTime <= '2013-06-31 23:59:59'
   AND d.SalesRep_ID = 6

这是SQLFiddle演示

Answer 2

您可以通过简单地组合它们在单个查询中执行此操作：

UPDATE Orders SET SalesRep_ID =  '6'
WHERE Order_ID IN (
   SELECT `o`.`Order_ID`
   FROM `Orders` `o`
   JOIN `CustomerDetails` `cd` ON `cd`.`Customer_ID` = `o`.`Customer_ID`
   WHERE `o`.`OrderPlaceServerTime` >= '2013-06-01 00:00:00'
      AND `o`.`OrderPlaceServerTime` <= '2013-06-31 23:59:59'
      AND `cd`.`SalesRep_ID` = 6
);

Answer 3

这有一个小技巧。 你必须欺骗MySQL以为你正在研究不同的表。

UPDATE Orders SET SalesRep_ID =  '6'
WHERE  (Order_ID IN (SELECT order_id FROM (SELECT `o`.`Order_ID`
FROM `Orders` `o`
JOIN `CustomerDetails` `cd` ON `cd`.`Customer_ID` = `o`.`Customer_ID`
WHERE `o`.`OrderPlaceServerTime` >= '2013-06-01 00:00:00'
AND `o`.`OrderPlaceServerTime` <= '2013-06-31 23:59:59'
AND `cd`.`SalesRep_ID` = 6) AS TEMP));

链接到SQLFiddle