这句话为何会报错？奇怪

这句话为什么会报错？奇怪。
select * from (

(select * from (select distinct b.CustomNm,b.CIFNm,b.ApproveNm,b.loannm, b.LoanAmount,a.LoanBalance,b.LoanPerid,
b.LoanStratDate,b.LoanEndDate,b.ComyLoanPurpose from InterestReceive a right join OPSInf b on a.ContractNm=b.LoanNm) aa

join 
---连接客户类型
 (select distinct * from (select a.LoanAccount,a.LoanNm,case b.LoanType 
  when '个人客户' then b.PerType
  when '企业客户' then b.ComyCustomType 
  else '' end tp
from
OPSInf a left join LoanInf b on a.CIFNm=b.CIFNm) cc ) dd
on aa.LoanNm =dd.LoanNm) bc

) sda


[解决办法]
最后那个) sda多出来了

SQL code

SELECT  * FROM    ( SELECT  *             FROM    ( SELECT DISTINCT                                 b.CustomNm ,                                 b.CIFNm ,                                 b.ApproveNm ,                                 b.loannm ,                                 b.LoanAmount ,                                 a.LoanBalance ,                                 b.LoanPerid ,                                 b.LoanStratDate ,                                 b.LoanEndDate ,                                 b.ComyLoanPurpose                       FROM      InterestReceive a                                 RIGHT JOIN OPSInf b ON a.ContractNm = b.LoanNm                     ) aa                     JOIN ---连接客户类型                     ( SELECT DISTINCT                                 *                       FROM      ( SELECT    a.LoanAccount ,                                             a.LoanNm ,                                             CASE b.LoanType                                               WHEN '个人客户' THEN b.PerType                                               WHEN '企业客户'                                               THEN b.ComyCustomType                                               ELSE ''                                             END tp                                   FROM      OPSInf a                                             LEFT JOIN LoanInf b ON a.CIFNm = b.CIFNm                                 ) cc                     ) dd ON aa.LoanNm = dd.LoanNm           ) bc
[解决办法]
SQL code
--MSSQL的括号只能用来括住数据集 而不能用来括住一个表--例如select * from (ta )a  --报错select * from (select * from ta)a --正确