通过从另一个表MySQL查询中选择数据来更新表

时间:2011-02-22 16:07:04

标签: mysql sql sql-update mysql-error-1242

我有两张桌子

订单表

or_id  count status
1        2    0
2        3    0
3        2    0

Order_Details表

ordetail         or_id    status
    1               1         1
    2               1         1
    3               2         0
    4               2         1
    5               2         1
    6               3         1
    7               3         1

如果在Order_Details表中对应的order_id的所有状态都是1,我希望更新订单表状态为1.我尝试使用此查询,但由于子查询返回的行超过1行,因此无法正常工作

UPDATE order o JOIN order_detail od ON o.or_id = od.or_id SET o.Status = 1 WHERE 
o.or_id= (SELECT or_id FROM order_detail GROUP BY or_id 
HAVING SUM(status = 1) = COUNT(*) ) 

提前致谢

1 个答案:

答案 0 :(得分:3)

首先根据状态更新查询:

UPDATE `order` o
  JOIN Order_Detail od ON o.or_id = od.order_id
SET o.Status = 1
WHERE od.Status = 1 

要检索的第二个查询:

SELECT DISTINCT order_id
FROM Order_Detail
WHERE status = 0

注意:如果订单有2个order_details,1)status = 0且2)status = 1.上面的查询将包含该订单 - 因为有一行status = 0.如果你只想检索订单ID都是status = 0.然后使用此查询:

SELECT order_id
FROM Order_Detail
GROUP BY order_id
HAVING SUM(status = 0) = COUNT(*)

更新:根据评论,由于您只想在所有订单详细信息均为1时设置status = 1,请使用此更新查询:

 UPDATE `order` o
  JOIN (
    SELECT order_id
    FROM Order_Detail
    GROUP BY order_id
    HAVING SUM(status = 1) = COUNT(*)
  ) og ON o.or_id = og.order_id
SET o.Status = 1