基于类别的价值总和

Question

我想使用 my-SQL 打印每一行中的类别总和，但我无法做到，谁能帮帮我，

示例：

store	region	sales
106	Atlanta	250000
107	Atlanta	300000
108	New England	100000
109	New England	150000
110	New England	270000

将其转换为如下表格

store	region	sales	total sales
105	Atlanta	200000	750000
106	Atlanta	250000	750000
107	Atlanta	300000	750000
108	New England	100000	520000
109	New England	150000	520000
110	New England	270000	520000

Answer 1

您可以将sum 用作window function：

select *, 
Sum(sales) over (partition by region) as TotalSales
from table