查询以获取如下结果
表价( 项目int, 整数, 数量int )
+-------+-------+----------+
| item | price | quantity |
+-------+-------+----------+
| box 1 | 1000 | 4 |
| box 2 | 2000 | 1 |
| box 3 | 3000 | 6 |
+-------+-------+----------+
结果
+-------+-------+----------+-----------+-------+
| item | price | quantity | sub total | total |
+-------+-------+----------+-----------+-------+
| box 1 | 1000 | 4 | 4000 | 16000 |
| box 2 | 2000 | 1 | 2000 | 18000 |
| box 3 | 3000 | 6 | 18000 | 36000 |
+-------+-------+----------+-----------+-------+
答案 0 :(得分:-1)
如果您的mysql版本低于8.0,则可以尝试以下
select
item,price,quantity,price*quantity as total,
@totalall:= @totalall + price*quantity as TotalAll
from price, (Select @totalall:= 0) as totalall;
或者,如果您的MySQL vsersion 8.0+,则可以在下面尝试-
SELECT
item,price,quantity,price*quantity as total,
SUM(price*quantity) OVER(ORDER BY item) AS TotalAll
FROM price;
答案 1 :(得分:-1)
从交叉联接(选择@sum:= 0)参数中选择数量,项(@sum:= @ sum +(item * amount))作为“数量”