如何使用加入从选择更新
如何更新也存在于子查询中的表?我必须分两个阶段完成吗?(创建一个临时表——将选中的数据放入其中,然后更新最终表)
How can I update a table that is also present in a subquery? Do I have to do it in 2 stages? (create a temporary table - put the selected data in it and then update the final table)
我正在尝试使用每个 CTN 的网络标签更新 invoiceLine 表.
I am trying to update the invoiceLine table with the label of the network for each CTN.
最终结果是:
发票行
ctn network
1234 network1
2345 network2
3456 network1
我有以下表格:
发票行
ctn network
1234 null
2345 null
3456 null
终端
terminal
ctn network
1234 1
2345 2
3456 1
网络
network
id label
1 network1
2 network2
我可以运行一个选择,但我不知道如何通过加入进行更新:
I can run a select but I'm not sure how to update with a join:
update invoiceLine
inner join terminal on terminal.ctn = invoiceLine.ctn
set invoiceLine.network =
(
select network.label
from invoiceLine
inner join terminal on terminal.ctn = invoiceLine.ctn
inner join network on network.id = terminal.network
)
where invoiceLine.ctn = terminal.ctn
但是 MySQL 抛出一个
but MySQL throws a
错误代码:1093.您不能在 FROM 子句中指定要更新的目标表invoiceLine"
Error Code: 1093. You can't specify target table 'invoiceLine' for update in FROM clause
推荐答案
UPDATE invoiceLine
INNER JOIN terminal
ON invoiceLine.ctn = terminal.ctn
INNER JOIN network
ON terminal.network = network.id
SET invoiceLine.network = network.label
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