Question

嘿所有我在尝试更新数据库中的表时遇到此错误：

每个派生表都必须有自己的别名

这是我想要更新的mysql查询：

 UPDATE (SELECT clientinfo.idNumber, clientinfo.theCompName, clientoffers.idNumber, 
 clientoffers.expTimeWaiting, clientoffers.theDateStart,
 clientoffers.theDateEnd, clientoffers.theOffer, clientoffers.isActive, 
 clientoffers.theType, clientoffers.fixedAmount, clientoffers.fixedUsed
 FROM clientinfo, clientoffers
 WHERE clientoffers.idNumber = clientinfo.idNumber
 AND clientoffers.theDateEnd >= '2010-06-03'
 AND clientoffers.theDateStart <= '2010-06-03'
 AND clientoffers.idNumber = 'NB351560'
 AND clientoffers.isActive = 'YES')
 SET clientoffers.fixedUsed = clientoffers.fixedUsed + 1

这似乎没问题，但由于某种原因似乎不起作用？

任何帮助都会很棒！：O）

更新

 sqltemp = "UPDATE clientinfo, clientoffers SET clientoffers.fixedUsed = clientoffers.fixedUsed + 1 WHERE clientoffers.idNumber = clientinfo.idNumber" & _
             "AND clientoffers.theDateEnd >= '2010-06-03'" & _
             "AND clientoffers.theDateStart <= '2010-06-03'" & _
             "AND clientoffers.idNumber = 'NB351560'" & _
             "AND clientoffers.isActive = 'YES'"
        oRecordset.Open sqltemp, oConnection,3,3

它给了我错误 ODBC驱动程序不支持请求的属性。

我正在使用经典ASP的Mysql 5.1。

大卫

Answer 1

为什么选择那里？那甚至是必要的吗？

为什么不：

 UPDATE clientinfo, clientoffers

 SET clientoffers.fixedUsed = clientoffers.fixedUsed + 1

 WHERE clientoffers.idNumber = clientinfo.idNumber
 AND clientoffers.theDateEnd >= '2010-06-03'
 AND clientoffers.theDateStart <= '2010-06-03'
 AND clientoffers.idNumber = 'NB351560'
 AND clientoffers.isActive = 'YES'

甚至更进一步，如果idNumber的两个表上存在外键约束（或者您可以假设每个clientoffer条目始终具有相应的clientinfo条目）：

 UPDATE clientoffers

 SET clientoffers.fixedUsed = clientoffers.fixedUsed + 1

 WHERE clientoffers.theDateEnd >= '2010-06-03'
 AND clientoffers.theDateStart <= '2010-06-03'
 AND clientoffers.idNumber = 'NB351560'
 AND clientoffers.isActive = 'YES'

Answer 2

“客户提供”。在括号外无效，所以你需要为select语句创建一个别名（尝试UPDATE（SELECT ...）foo SET foo.fixedUsed = foo.fixedUsed + 1

但是，让更新一次只能在一个表上运行更简单：

UPDATE clientoffers
SET fixedUsed = fixedUsed + 1
WHERE
EXISTS (SELECT * FROM clientinfo WHERE
clientoffers.idNumber = clientinfo.idNumber)
AND clientoffers.theDatEnd >= '2010-06-03'
AND clientoffers.theDateStart <= '2010-06-03'
AND clientoffers.idNumber = 'NB351560'
AND clientoffers.isActive = 'YES

但是，根据MySQL版本，可能不支持EXISTS子查询语法。如果是这种情况，您可以：

a。）升级MySQL或切换到另一个数据库引擎 b。）使用您的代码在循环中运行select，然后，对于每个返回的行，发出一个更新语句，记住锁定两个表。

mySQL更新问题

2 个答案: