mysql对每行求和

查询以获得如下结果

表价( 项目int， 金额int， 数量int， )

---

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 |
+-------+-------+----------+-----------+-------+

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如果您的mysql版本低于8.0，您可以在下面尝试

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 vVersion 8.0+可以在下面进行尝试-

SELECT 
    item,price,quantity,price*quantity as total, 
    SUM(price*quantity) OVER(ORDER BY item) AS TotalAll
FROM price;

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选择项目、金额（@sum:=@sum+（项目*金额））作为交叉联接的数量（选择@sum:=0）参数

请应用格式。你试过什么？你想要什么结果？你的mysql版本是什么？

SELECT 
    item,price,quantity,price*quantity as total, 
    SUM(price*quantity) OVER(ORDER BY item) AS TotalAll
FROM price;