Question

我收到错误消息“子查询返回多个值”，如何在我的情况下使用join来解决此问题

SELECT fdCI.INITIALPROCESSINGUSER,
       fdCI.NEWUNDERWRITINGUSER,
       fdCI.ISSUEPOLICYUSER,
       fdR.REFERTOREASON,
       fdR.PUTONHOLDREASON,
       fdP.POLICYNUMBER,
       fdP.INSUREDNAME,
       p.WFSTATE,
       p.WFLOCKTYPE ,
       p.WFLOCKUSER,
       p.WORKFLOWID,
       p.WFWORKITEMID,
       p.WFROUTINGTICKETID,
       p.WFWORKSTEPNAME,
       p.WFSTEPENTRYTIME,
       p.WFPRIORSTEPNAME,
       fdp.OWNERNAME,
       fdR.REFERREDFROMUSERID,
       fdp.CLIENTCODE,
       p.WFFLOWENTRYTIME,
       c.ACL,
       fdp.PRODUCT,
       PLANCODE
FROM PINewBusiness p,
     CFPolicyCaseFolder c,
     FDRounting fdR,
     FDPolicyDetails fdP,
     FDCaseInformation fdCI
WHERE (p.WFWORKSTEPNAME = 'ApproveQuote'
       OR p.WFWORKSTEPNAME = 'ApprovalForm')
  AND fdCI.AUTHORIZATIONUSER IS NULL
  AND (fdR.NBAMOUNT <=
         (SELECT cul.NBLIMIT
          FROM FDNBUserAuthorization cua,
               FDNBAuthorizationLevel cul
          WHERE cua.NBAUTHORIZATIONID = cul.S_ROWID
            AND cua.USER_ID = 'obaidats'
            AND cul.NBTYPE= fdR.NBTYPE))
  AND (c.CASEFOLDERID = SUBSTRING(p.CFREPKEY, 9, LEN(p.CFREPKEY)))
  AND c.CASEFOLDERID=fdR.PARENT_CASEID
  AND c.CASEFOLDERID=fdP.PARENT_CASEID
  AND c.CASEFOLDERID=fdCI.PARENT_CASEID
  AND (fdP.RAPIDUND IS NULL
       OR fdP.RAPIDUND = 0)

Answer 1

您可以检查下面的子查询的输出吗？

SELECT cul.NBLIMIT
FROM FDNBUserAuthorization cua,
FDNBAuthorizationLevel cul
WHERE cua.NBAUTHORIZATIONID = cul.S_ROWID
AND cua.USER_ID = 'obaidats'
AND cul.NBTYPE= fdR.NBTYPE

它肯定会返回多行，因为错误消息是不言自明的。现在，检查cul.NBLIMIT列中返回的值是多少？如果所有值都相同并且您可以保留其中任何一个，只需选择下面的TOP 1-

注意：

TOP 1适用于MSSQL Server，对于MySQL和Oracle，您可以使用-LIMIT 1

SELECT TOP 1 cul.NBLIMIT
FROM FDNBUserAuthorization cua,
FDNBAuthorizationLevel cul
WHERE cua.NBAUTHORIZATIONID = cul.S_ROWID
AND cua.USER_ID = 'obaidats'
AND cul.NBTYPE= fdR.NBTYPE

但是，如果不同行中的值不同，则需要首先定义如何通过应用聚合器（如-SUM，MAX，MIN如下所示）将它们转换为一个值-

SELECT MAX(cul.NBLIMIT)
....

Answer 2

对于此子查询，您应确保其返回的行不超过一个：

选择路线NBLIMIT 从FDNBUserAuthorization提示， FDNBAuthorizationlevel课程在哪里cua.NBAUTHORIZATIONID = cul.S_ROWID AND cua.USER_ID ='obaidats' AND cul.NBTYPE = fdR.NBTYPE

从技术上解决此问题的两个选项

选择 MIN / MAX （cul.NBLIMIT）从FDNBUserAuthorization提示， FDNBAuthorizationlevel课程在哪里cua.NBAUTHORIZATIONID = cul.S_ROWID AND cua.USER_ID ='obaidats' AND cul.NBTYPE = fdR.NBTYPE

OR

选择路线NBLIMIT 从FDNBUserAuthorization提示， FDNBAuthorizationlevel课程在哪里cua.NBAUTHORIZATIONID = cul.S_ROWID AND cua.USER_ID ='obaidats' AND cul.NBTYPE = fdR.NBTYPE WROWE ROWNUM = 1

我的子查询返回多个值，但出现错误

2 个答案: