Question

使用SQL Server 2012.尝试根据两个不同工作流程/条件的员工ID获取计数。最终，希望有三列; EmpID，计数方法1，计数方法2.尝试了几个子查询，但我被卡住了。

-- Returns count for workflow 1
select 
    s.id [Employee ID], count(r.requisitionnumber)[Method 1] 
from 
    requisition r
left outer join 
    staff s on r.placerkey = s.staffkey
left outer join 
    location l on r.placerSignedInLocationKey = l.locationkey
group by 
    s.id

-- Returns count for workflow 2
select distinct 
    s.id [Employee ID], count(distinct(r.requisitionnumber) [Method 2]
from 
    requisition r
left outer join 
    orderedpanel op on r.requisitionkey = op.requisitionkey
left outer join 
    staff s on s.staffkey = op.staffkeyreleasedorderchoices 
            and staffKeyReleasedOrderChoices > 1
group by 
    s.id

Answer 1

您始终可以使用联接来连接两个不同的查询：

select 
    [Employee ID],
    [Method 1],
    [Method 2]
from (
    --Gives count for workflow 1
    select s.id [Employee ID], count(r.requisitionnumber)[Method 1] 
    from requisition r
    left outer join staff s
    on r.placerkey=s.staffkey
    left outer join location l on r.placerSignedInLocationKey=l.locationkey
    group by s.id
) workflow1
inner join (
    --Gives count for workflow 2
    select distinct s.id [Employee ID],count(distinct(r.requisitionnumber)  [Method 2]
    from requisition r
    left outer join orderedpanel op
    on r.requisitionkey=op.requisitionkey
    left outer join staff s on s.staffkey=op.staffkeyreleasedorderchoices
    where staffKeyReleasedOrderChoices >1
    group by s.id
) workflow2 on workflow1.[Employee ID] = workflow2.[Employee ID]

根据涉及不同表格的条件计数

1 个答案: