Question

项目有多个任务，其中有多个任务

项目（1-n） - ＆gt;任务（1-n） - ＆gt;分配

“任务”表中的字段是“计划时间”。

“作业”表上的字段为“已指定时间”。

如何在单个查询中获取所有项目的计划时数和分配时间？

Answer 1

编辑：此答案提供的结果不正确，但我会将其保留用于历史目的。

我认为这会帮助你。我无法弄清楚如何摆脱Distinct。

Select Distinct  
        Project.ProjectId,
        Sum(Task.PlannedHours) 
            Over (Partition By Project.ProjectId) As PlannedHours,
        Sum(Assignment.AssignedHours) 
            Over (Partition By Project.ProjectId) As AssignedHours
From Project 
    Inner Join Task On Project.ProjectId = Task.ProjectId   
    Inner Join Assignment On Task.TaskId= Assignment.AssignmentId

这是我的测试脚本。

Declare @Project Table (ProjectId Int)
Declare @Task Table (TaskId Int, ProjectId Int, PlannedHours Int)
Declare @Assignment Table (AssignmentId Int, TaskId Int, AssignedHours Int)

Insert Into @Project (ProjectId) values (1)
Insert Into @Project (ProjectId) values (2)
Insert Into @Project (ProjectId) values (3)

Insert Into @Task (TaskId, ProjectId, PlannedHours) values (1, 1, 10)
Insert Into @Task (TaskId, ProjectId, PlannedHours) values (2, 1, 10)
Insert Into @Task (TaskId, ProjectId, PlannedHours) values (3, 2, 11)
Insert Into @Task (TaskId, ProjectId, PlannedHours) values (4, 3, 12)

Insert Into @Assignment (AssignmentId, TaskId, AssignedHours) values (1, 1, 2)
Insert Into @Assignment (AssignmentId, TaskId, AssignedHours) values (2, 1, 2)
Insert Into @Assignment (AssignmentId, TaskId, AssignedHours) values (3, 2, 2)
Insert Into @Assignment (AssignmentId, TaskId, AssignedHours) values (4, 3, 3)

Select Distinct 
        Project.ProjectId,
        Sum(Task.PlannedHours) 
            Over (Partition By Project.ProjectId) As PlannedHours,
        Sum(Assignment.AssignedHours) 
            Over (Partition By Project.ProjectId) As AssignedHours   
From @Project Project 
    Inner Join @Task Task On Project.ProjectId = Task.ProjectId   
    Inner Join @Assignment Assignment On Task.TaskId= Assignment.AssignmentId

Answer 2

select p.ProjectID, t.PlannedHoursSum, a.AssignedHoursSum
from Projects p
inner join (
    select ProjectID, sum(PlannedHours) as PlannedHoursSum
    from Tasks
    group by ProjectID
) t on p.ProjectID = t.ProjectID
inner join (
    select t.ProjectID, sum(AssignedHours) as AssignedHoursSum
    from Tasks t
    inner join Assignments a on t.TaskID = a.TaskID
    group by t.ProjectID
) a on p.ProjectID = a.ProjectID

SQL查询 - 从两个不同级别的层次结构中获取总和

2 个答案: