Question

项目有多个任务,有多个任务

项目(1-n)->任务(1-n)-> 转让

任务表上的一个领域是规划时间。

任务表中的一个领域是分配时数。

在单一询问中,我如何获得所有项目的计划小时和签署时间?

Answer 1

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

Answer 2

www.un.org/Depts/DGACM/index_spanish.htm EDIT: 回答不正确,但为了历史目的,我将放弃。

我认为,这将有助于你走出来。我可以说明如何删除<代码>Disique。

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

这里是我的试稿。

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

友情链接