帮我优化一下这段代码（select uuid() as id , a.customerCode as customerCode , a.customerName as customerName , a.unifiedSocialCreditCode as unifiedSocialCreditCode , a.firstInsuranceCode as firstInsuranceCode , a.firstInsuranceName as firstInsuranceName , a.firstRiskCode as firstRiskCode , a.firstRiskName as firstRiskName , a.secondRiskCode as secondRiskCode, a.secondRiskName as secondRiskName, cast(a.secondRiskBasicScore as DECIMAL(6,2)) as secondRiskBasicScore , cast(a.secondRiskBasicScore as DECIMAL(6,2)) as secondRiskScore , to_date(date_add(now(),-1)) as createDate from ( select a.customerCode, a.customerName, a.unifiedSocialCreditCode,'ALL' AS firstInsuranceCode,'全险种' AS firstInsuranceName,c.firstRiskCode,c.firstRiskName,c.secondRiskCode,c.secondRiskName, sum((case when (a.POLICYSTATUS = 'A') then a.sumAssured when (a.POLICYSTATUS = 'B') then (a.PAYOUT+a.OUTSTANDING) else a.sumAssured end) / b.AllcustomersumAssured * c.secondRiskScore) as secondRiskBasicScore from ccic_fkyjrisk.FocusCustomerPolicyData a join ccic_fkyjrisk_orig.InsuranceProductGroup d on d.scoreCardType='0' and a.insuranceCode = d.insuranceCode join ccic_fkyjrisk.PolicyRiskSecondScore c on a.customerCode = c.customerCode and a.policycode=c.policycode and firstRiskCode = '002' join ccic_fkyjrisk.TargetcustomerRanking b on b.firstInsuranceCode ='ALL' and a.customerCode = b.customerCode where (case when (a.POLICYSTATUS = 'A') then a.sumAssured when (a.POLICYSTATUS = 'B') then (a.PAYOUT+a.OUTSTANDING) else a.sumAssured end)>0 and length(nvl(cast((case when (a.POLICYSTATUS = 'A') then a.sumAssured when (a.POLICYSTATUS = 'B') then (a.PAYOUT+a.OUTSTANDING) else a.sumAssured end) as string),''))>0 and (a.firstInsuranceName!='健康险' and a.insuranceCode not in('5IE','5VA','5XA','5XC','5XE','EFD','EFM','EFW','EGB','EGM', 'EGZ','EIA','EIB','EIE','EIF','EIH','EIZ','ERQ','ERW','ERY','ERZ','ESZ','ETB','ETC', 'ETR','ETX','ETZ','EVA','EVB','EXA','EXB','EXE','EYM','4DJ','EGD','5GD','ZCJ','ZCF') and a.secondInsuranceName not in('家庭财产保险','农业保险') and a.insuranceCode not like 'YEE%' and a.insuranceCode not like 'YAC%') group by a.customerCode, a.customerName, a.unifiedSocialCreditCode,c.firstRiskCode,c.firstRiskName,c.secondRiskCode,c.secondRiskName) a;）

这段代码较为复杂，需要结合实际情况进行具体优化。以下是一些可能的优化方向：

1. 使用JOIN语句代替子查询，可以提高效率。
2. 尽可能避免使用CASE WHEN语句，可以使用IF语句替代。
3. 评估数据表的索引情况，添加合适的索引可以提高查询效率。
4. 尽可能使用整数类型代替DECIMAL类型，可以提高计算效率。
5. 对于WHERE条件中的常量字符串，使用常量变量代替，可以减少字符串比较次数。
6. 将复杂的计算过程拆分成多个步骤，可以提高代码可读性，也有利于代码优化。

具体的优化细节需要根据实际情况进行分析和实验。