SQL查询中的连接计数和非分组属性

Question

我通过在我的数据库中加入几个表来获得以下数据。我需要三列一项目计数、分组属性和“带有项目计数的属性”，我需要查询的结果为 项目 ,%complete 和 Category as
2,0,c1-1c2-1
1,25,c3-1
1,50,c4-1
数据集：

选择 a1.projectid,
a2.完成(%),
a3.类别
来自 a1
在 a1.id=a2.id 上加入 a2
在 a1.id=a3.id 上加入 a3

当查询的结果是 项目 %完成类别
A100 0 C1
A200 0 C2
A300 25 C3
A400 50 C4

然后我需要将 project 、%complete 和 Category 的计数拉为 2,0,c1-1c2-1
1,25,c3-1
1,50,c4-1
任何建议如何实现这一点。

Answer 1

Oracle 中的参考示例假设您基于 %complete 进行检查：

with table1 as 
(
select 'A100' as project ,0 as complete_percent, 'C1' as category from dual
union
select 'A200', 0,'C2' from dual
union
select 'A300', 25,'C3' from dual
union
select 'A400', 50,'C4' from dual
union
select 'A500', 0,'C5' from dual
union
select 'A600', 25,'C6' from dual
union
select 'A700', 50,'C7' from dual
union
select 'A800', 60,'c8' from dual
)
select distinct count_prj,complete_percent,listagg(str) within group  (order by NULL) over (partition by complete_percent) 
from (select count(*) over (partition by complete_percent) count_prj,complete_percent,
category || '-' || count(*) over (partition by category,complete_percent) str 
from table1);