mysql - 使用求和函数更新表时组函数的使用无效

Question

我有两个表:o_daily_lcsgeneration 和 o_daily_generation。

在尝试更新 o_daily_generation 时，我收到一条错误消息:

error(1111) invalid use of Group function

这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)

Answer 1

试试这个:

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