在sqlserver中如何使用CTE解决复杂查询问题

最近，同事需要从数个表中查询用户的业务和报告数据，写了一个SQL语句，查询比较慢：

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  

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