带条件的 SQL 双聚合函数

Question

我有一张桌子，看起来像是在闲置。

DepartmentId    | Salary  | Status       
----------------------------------
1               |  5     | active
1               |  10     | active
1               |  15     | passive
1               |  20     | passive

我想选择这个带有闲置输出的表。

Columns:
DepartmentId,
Sum of salary where status is active ,
Sum of salary where status is passive.


DepartmentId    | Sum(salary) where status is active  | Sum(salary) where status is passive       

-------------------------------------------------------------------------------------------
    1           |  15                                 | 35

我使用 postgresql 作为数据库。 我如何查询表以获取输出为上？ 谢谢。

Answer 1

select
    departmentid,
    sum(case status when 'active' then salary else 0 end) as active_salary_sum,
    sum(case status when 'passive' then salary else 0 end) as passive_salary_sum
from t
group by departmentid

Answer 2

很简单，您是要优化还是要我们为您编写查询？

Select DepartmentId,
Sum (case when status='active' then salary end) as SumOfActive ,
Sum (case when status='passive' then salary end) as SumOfPassive
From TableName
Group By DepartmentId