mysql：一些数据的总和除以同一个表中的总数据的总和

Question

   date          value 
   2012-01-01     124
   2012-01-02     250
   2012-04-21     56
   2012-07-06     198 
   2012-09-24     650
   2013-07-07    1000

我想“汇总”2012-01-01至2012-07-06的价值，并在同一张表中除以2012-01-01至2013-07-07的“总和”。< / p>

Answer 1

SELECT (SELECT SUM(value) FROM yourTable WHERE date BETWEEN '2012-01-01' AND '2012-07-06') /
       (SELECT SUM(value) FROM yourTable WHERE date BETWEEN '2012-01-01' AND '2013-07-07')

或：

SELECT SUM(IF(date BETWEEN '2012-01-01' AND '2012-07-06'), value, 0)) /
       SUM(IF(date BETWEEN '2012-01-01' AND '2013-07-07'), value, 0))
FROM yourTable

Answer 2

Select sum(if(date between ... and ..., value, 0)/sum(value)
from table where date beteen ... and ...

在if（）中使用较小的日期范围，在where条件中使用较宽的日期范围。