使用CTE解决复杂查询的问题_MySQL

Select 
S.Name,
S.AccountantCode,
(
Select COUNT(*) from (
Select Distinct BusinessBackupId from Biz_BusinessBackupCustomer where Id in (
Select BusinessBackupCustomerId from Rpt_RegistForm where ( SignatureCPA1Id=S.Id or SignatureCPA2Id=S.Id  ) and DocStatus=30  
) ) T 
) as 'BNum',
(case when R.Id is null then 0 else 1 end ) as 'Num', 
R.ReportBackupDate 
from 
Base_Staff S 
left join Rpt_RegistForm R on  (  R.SignatureCPA1Id=S.Id or R.SignatureCPA2Id=S.Id )  and R.DocStatus=30 
where S.UserType=3 

With CTE as
(
select 
       --s.Id as S_ID,
       s.Name ,s.AccountantCode,
       r.BusinessBackupCustomerId --, r.Id as R_ID ,r.SignatureCPA1Id,r.SignatureCPA2Id
from   Base_Staff  S 
left join  Rpt_RegistForm   R 
       on  (  R.SignatureCPA1Id=S.Id or R.SignatureCPA2Id=S.Id ) and r.DocStatus=30 
where s.UserType=3 

)
select t0.*
,(
  Select COUNT(*)  from (
    Select Distinct BusinessBackupId 
    from Biz_BusinessBackupCustomer b
    inner join CTE on b.Id =CTE.BusinessBackupCustomerId
    where t0.AccountantCode=CTE.AccountantCode
) t1
) as '约定书数'
from 
(
select Name, AccountantCode,COUNT( BusinessBackupCustomerId) as '报告数'
from CTE
group by Name,AccountantCode
) t0