将多个SQL select语句组合为列

将多个select语句组合为一列，不会给出所需的输出。我错过了什么？Group by子句未按预期工作。我是否也需要将GroupBy用于外部选择

SQL查询：

use [Test_DB]
SELECT  a.fldYear,a.fldMonth, a.ConnPoints,b.NonConnPoints from 
(Select  DATEPART(YEAR, e.TestDate) as [fldYear], DATENAME(month,e.TestDate) as [fldMonth], count(e.equipid) as [ConnPoints] from dbo.equip e 
where e.pID<>0 and e.TestDate between '01-01-2020' and '12-31-2020' 
Group By  DATEPART(year,e.TestDate), DATENAME(month,e.TestDate), DATEPART(month,e.TestDate)) as a,

(Select  DATEPART(YEAR, e.TestDate) as [fldYear], DATENAME(month,e.TestDate) as [fldMonth], count(e.equipid) as [NonConnPoints] from dbo.equip e 
where e.PID=0 and e.TestDate between '01-01-2020' and '12-31-2020' 
Group By  DATEPART(year,e.TestDate), DATENAME(month,e.TestDate), DATEPART(month,e.TestDate)) as b

我正在寻找的产出：应该显示2020年12个月的数据

fldYear  fldMonth   ConnPoints      NonConnPoints
2020     January    13456             73456
2020     February   8345666           8375666
2020     March      734566            8366
2020     April      734569            334469
2020     May        43456             13456
2020     June       33456             3456
2020     July       5345663           45663
2020     August     345661            75661
2020     September  345662            245662
2020     November   345668            645668
2020     December   534566            538866

---

是否只需要条件聚合：

select year(e.TestDate), month(e.TestDate),
       sum(case when e.pID <> 0 then 1 else 0 end) as ConnPoints,
       sum(case when e.pID = 0 then 1 else 0 end) as NonConnPoints
from dbo.equip e 
where e.TestDate between '2020-01-01' and '2020-12-31'
group by year(e.TestDate), month(e.TestDate)
order by year(e.TestDate), month(e.TestDate)

选择年份（如TestDate），月份（如TestDate），
求和（当e.pID为0时，则为1，否则为0结束）作为连接点，
总和（当e.pID=0时，则为1，否则为0结束）作为非点
来自dbo.e
其中e.TestDate介于“2020-01-01”和“2020-12-31”之间
按年份（如TestDate）、月份（如TestDate）分组
按年份（如TestDate）、月份（如TestDate）排序的订单

@DaleK删除了我之前发布的图片，谢谢。它有效了（谢谢：），因为我已经将问题更新为更一般的问题。我根据它编辑了答案。

select year(e.TestDate), month(e.TestDate),
       sum(case when e.pID <> 0 then 1 else 0 end) as ConnPoints,
       sum(case when e.pID = 0 then 1 else 0 end) as NonConnPoints
from dbo.equip e 
where e.TestDate between '2020-01-01' and '2020-12-31'
group by year(e.TestDate), month(e.TestDate)
order by year(e.TestDate), month(e.TestDate)