使用SUM函数更新表时,GROUP函数的使用无效
我有两个表:o_daily_lcsgeneration
和o_daily_generation
。
尝试更新o_daily_generation
时收到错误消息:
error(1111) invalid use of Group function
以下是我正在运行的代码:
update o_daily_generation join o_daily_lcsgeneration
on o_daily_generation.Location =o_daily_lcsgeneration.Location
and o_daily_generation.Date =o_daily_lcsgeneration.Date
set o_daily_lcsgeneration.Turbine_Generation =sum(o_daily_generation.Turbine_Generation)
解决方案
改为尝试此操作:
UPDATE o_daily_generation od
INNER JOIN
(
SELECT Location, SUM(Turbine_Generation) TurbineSum
FROM o_daily_lcsgeneration
GROUP BY Location
) og ON od.Location = og.Location
SET od.Turbine_Generation = og.TurbineSum
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