选择“对 MYSQL 求和”

Question

我需要为员工属于一个部门的每一天选择一个数据总和，我希望能够选择一个日期范围并拥有每天的摘要，这是可能的，目前我只是在一个字段中获得整个日期范围的摘要。

这是我目前的查询

select 
  date, 
  SUM(no_of_live_products) 
from 
    fulfilment 
INNER JOIN 
  employee 
  ON  employee.employee_id = fulfilment.employee_id 
where 
      employee.department = 'Telecoms    Services' 
  and date >= '2013-09-16' 
  and date <= '2013-09-29'

是否可以获取该日期范围内每天的数据摘要？

Answer 1

你可以

GROUP BY `date` 

查看每天的总和

Answer 2

如果要获取天数并且有多个时间范围，

首先，获取单个时间范围的日期数，然后将这些日期数相加(需要子选择(。

以这个为例，这不是针对您的情况的完整查询：

SELECT SUM(x.days)
FROM (
    SELECT TIMESTAMPDIFF(DAY, startDate, endDate) AS days
    FROM fulfilment 
) x
GROUP BY employee.employee_id

Answer 3

为什么不试试

SELECT 
  date, 
  SUM(no_of_live_products) 
FROM 
    fulfilment 
INNER JOIN 
  employee ON  employee.employee_id = fulfilment.employee_id 
WHERE 
      employee.department = 'Telecoms    Services' 
  AND date >= '2013-09-16' 
  AND date <= '2013-09-29'
GROUP BY date(date)