Question

我想按日期提供一些日常报告。我希望这些数据每天都在增加。

Date            qty       QP
2010-09-01       10       10 
2010-09-02       3        13  (it means result QP from 2010-09-01 accumulate with 2010-09-02)
2010-09-03       8        21

这是第一个代码：

SELECT Date, SUM(number) AS qty FROM calc GROUP BY Date

如何显示“QP”如果实际上我不需要显示“数量”字段（自动计数）只显示日期和QP但它仍然可以计数？

Answer 1

SET @r := 0;
SELECT  date, @sum := SUM(number) AS qty, @r := @r + @sum AS qp
FROM    calc
GROUP BY
        date

Answer 2

此示例将帮助您确定：

MySQL select "accumulated" column

使用MySQL进行日常报告

2 个答案: