加入多个表给了我太多的金额

Question

我有两张桌子：1。EMP（持有员工信息）和2.活动（包含empid，status：working，leave）。 状态可能重复，因此我可以在同一日期重复相同的状态。

我希望我的输出位于以下列中：

 emp absence working
---- ------- --------

我的查询如下：

select id ,employee, count(tr)as [working] , count(om) as [Absence]
from(
    ( select emp_id as id,  rep as employee from emp) as [pc101]
    left outer join
    (
    select distinct emp_id, mydate as [tr]
    from activities
    where status = "Working"
    ) as [pc1]

on pc1.emp_id = pc101.id
)
left outer join
    (
    select distinct emp_id, mydate as [om]
    from activities
    where status = "absent"
    ) as pc2
on pc101.id = pc2.emp_id
group by employee, id

我使用了左外连接来确保即使是符合条件的员工也会出现。 问题在于，当员工具有这两种状态时，工作和工作的价值总和。不存在。