分组的整体得分基于值的范围和SQLite中

Question

的得分表中所列数据的约当人们开始和一个大表完成任务，例如：

 
Person | Task | Date started | Date ended 
--------------------------------------------- 
A  Cleaning 20-FEB-2012 22-FEB-2012 
N  Dishes 20-FEB-2012 24-FEB-2012 
Z  Cleaning 21-FEB-2012 23-FEB-2012 

和分配的分数评分表2,3,4每个任务根据他们花多长时间才能做到这一点，如：

 
| Task | Days taken | Score 
--------------------------- 
Cleaning  2  2 
Cleaning  1.5  3 
Cleaning  1  4 
Dishes  3  2 
Dishes  2.5  3 
Dishes  2  4 

我怎么可能会生成查询这给每个人的综合得分为每个任务，例如：

 
Person | Task | Overall Score 
--------------------------------------------- 
A  Cleaning 3.1 
A  Dishes 2.7 
N  Cleaning 3.4 

该解决方案一直在巧妙地避开我，一些帮助将不胜感激！目前我正在使用SQLite。

Answer 1

您的定义含糊不清。但是，以下内容可以帮助您：

select t.person, t.task, sum(s.score) 
from tasks t left outer join 
    score s 
    on t.task = s.task and 
     s.daysTaken = t.julianday(dateended) - t.julianday(datestarted) 
group by t.person, t.task 

处理范围有点困难。您需要获取间隔的两端，然后执行加入：

select t.person, t.task, sum(s.score) 
from tasks t left outer join 
    (select s.*, 
      (select min(days_taken) from score s2 where s2.person = s.person and s2.task = s.task and s2.days_taken > s.days_taken 
      ) as nextDays_Taken 
     from score s 
    ) s 
    on t.task = s.task and 
     t.julianday(dateended) - t.julianday(datestarted) >= s.days_taken and 
     t.julianday(dateended) - t.julianday(datestarted) < nextDays_Taken 
group by t.person, t.task