Question

SELECT ReviewMain.LoanID AS [Loan ID], ReviewMain.Asofdate AS [As of Date],  
  (SELECT CreditRating FROM  tblReviewScalars AS Review 
   WHERE (Review.AsOfDate = (SELECT Max(AsOfDate) FROM tblReviewScalars 
                             WHERE AsOfDate<#4/19/2011#))
     AND (Review.LoanID=ReviewMain.LoanID)
     AND (Review.Asofdate=ReviewMain.Asofdate)) 
  AS [CreditRatingAt prior AsOfDate], 
FROM tblReportVectors AS ReportMain INNER JOIN
     tblReviewScalars AS ReviewMain ON (ReportMain.LoanID = ReviewMain.LoanID) 
                                 AND (ReportMain.AsOfDate = ReviewMain.AsOfDate)
WHERE (ReviewMain.Asofdate= DateValue(FunAsofdate()))
GROUP BY ReviewMain.LoanID, ReviewMain.Asofdate;

在上面的查询中我有外部查询＆amp;内部查询我得到了两个答案，但是当我在内部查询中写(Review.LoanID=ReviewMain.LoanID) AND (Review.Asofdate=ReviewMain.Asofdate)时，我得到空白值，但是实际答案是信用是CCC-。是内部查询的任何解决方案。

Answer 1

这个子查询：

(SELECT Max(AsOfDate) FROM tblReviewScalars 
 WHERE AsOfDate<#4/19/2011#)

在2011年4月19日之前为所有贷款返回最大AsOfDate，而不是当前行中贷款的最大AsOfDate。您需要将上面的子查询更改为：

(SELECT Max(AsOfDate) FROM tblReviewScalars AS MaxPrior
 WHERE MaxPrior.AsOfDate<#4/19/2011# 
   AND MaxPrior.LoanID=ReviewMain.LoanID)

此外，您需要删除行AS [CreditRatingAt prior AsOfDate],上的尾随逗号，以便在语法上正确识别SQL。

内部查询中的问题

1 个答案: