Sql server 如何在SQLServer中将UNIONALL包含查询作为标量函数

我试图创建一个标量函数，其中包含所有3个查询的ui，但我无法创建这里是我的查询

USE [dbname]
GO
/****** Object:  UserDefinedFunction [dbo].[userinfo_getcountofemplyoee1]    Script Date: 3/23/2017 11:51:22 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create FUNCTION [dbo].[userinfo_gettotalcountofemplyoee](@parm Nvarchar(50)) RETURNS INTEGER

AS
BEGIN
   DECLARE @id INTEGER,@child nvarchar


   ;with cte as
(
   select userid, reportTo 
from userinfo a
where not exists (select * from userinfo b where b.reportTo = a.userid)

union all

select ui.userid, ui.reportTo 
from userinfo ui join cte on cte.reportTo = ui.userid 
where ui.reportTo is not null

union all

select cte.userid, ui.reportTo 
from userinfo ui join cte on cte.reportTo = ui.userid
where cte.reportTo is not null
)
, managers as (
select x.reportTo, count(*) TotalempUnderUser 
from (select distinct userid, reportTo 
      from cte 
      where reportTo is not null) x 
      group by x.reportTo)

      select managers.TotalempUnderUser 
from managers where  managers.reportTo=627

union all 

select  0 
from userinfo ui left join managers on ui.userid = managers.reportTo 
where managers.reportTo is null and userid=627

    select @id=TotalempUnderUser from cte

    return @id
END

但我得到了错误

Msg 444，第16级，状态2，程序userinfo_GetCountOfEmployee1，第9行 函数中包含的Select语句无法向客户端返回数据

我已经更新了答案，请现在检查

我的样本数据是

userid         FLname     ReportTo        TotalempUnderUser

1               abc         null            4
2               xyz         1               2
3               aaa         1               0
4               wer         2               1

预期产量为

TotalempUnderUser
4

---

您可以这样做：

Declare @n int

;with cte as
(
    Your query here that returns TotalempUnderUser
)
select @n=column_name from cte

return @n

或者看起来像你的

Declare @id integer

    ;with cte as
    (
        Your query here that returns TotalempUnderUser
    )
    select @id=column_name from cte

    return @id

---

你的cte返回了多少条记录？只有一条记录TotalempUnderUserok等等……你明白我的意思了吗。。我只是简短地给出它，让您尽快理解。好的，我将尝试帮助您构建查询逐个构建查询。您能在此处提供示例数据和预期结果吗？请稍等