mysql - 更新查询失败，错误为 : 1175

Question

我正在尝试使用以下查询更新表

update at_product A join
(
SELECT atbillfields.billeditemguid,count(*) AS numberOfPeopleBought
    ,sum(atbillfields.billeditemqty) AS soldquantity
FROM jtbillingtest.at_salesbill atsalesbill 
JOIN jtbillingtest.at_billfields atbillfields
    ON atsalesbill.billbatchguid=atbillfields.billbatchguid
WHERE atsalesbill.billcreationdate BETWEEN '2013-09-09' AND date_add('2013-09-09', INTERVAL 1 DAY)
GROUP BY atbillfields.billeditemguid) B ON B.billeditemguid = A.productguid
SET A.productQuantity = A.productQuantity - B.soldquantity

但是，得到以下异常:

Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect.

当我给 where 子句加上像 A.productQuantity = 1 这样的更新时，它更新了那个特定的。

有人可以指出为什么我无法执行查询以及如何解决这个问题吗？

Answer 1

看看:

http://justalittlebrain.wordpress.com/2010/09/15/you-are-using-safe-update-mode-and-you-tried-to-update-a-table-without-a-where-that-uses-a-key-column/

如果你想在没有 where 键的情况下更新，你必须执行

SET SQL_SAFE_UPDATES=0;

就在您的查询之前。

另一种选择是重写您的查询或包含一个键。