访问 SQL 查询以仅显示重复记录的最近日期

Question

下面是我当前显示所有记录的 MS Access SQL。但是，如果存在重复的帐户记录，则应仅显示具有最晚日期 ComputationPeriodStartingDate 的记录

数据集示例。所有不重复的都应退回，帐户 1005 是唯一的重复，只有 2021 年 12 月 1 日的副本应包含在退货中

Account	ComputationPeriodStartingDate	LastName	Categories
10001	12/1/2021	Kent	Active
10005	12/1/2021	Nashton	Active
10005	6/1/2021	Nashton	Active
10011	1/1/2022	Steele	Active
10015	12/1/2021	Rich	Active

我不知道如何正确过滤当前的 SQL。

SELECT [TDS LOANS].Account, [TDS Escrow Projections].ComputationPeriodStartingDate, [TDS LOANS].LastName, [TDS LOANS].Categories
FROM [TDS Escrow Projections] INNER JOIN [TDS LOANS] ON [TDS Escrow Projections].LoanRecID = [TDS LOANS].RecID
WHERE ((([TDS LOANS].PrinBal)<>0))
ORDER BY [TDS LOANS].Account, [TDS Escrow Projections].ComputationPeriodStartingDate DESC;

预期结果

Account	ComputationPeriodStartingDate	LastName	Categories
10001	12/1/2021	Kent	Active
10005	12/1/2021	Nashton	Active
10011	1/1/2022	Steele	Active
10015	12/1/2021	Rich	Active

Answer 1

尝试使用子查询：

SELECT a.Account, a.ComputationPeriodStartingDate, a.LastName, a.Categories
    FROM
      (
SELECT [TDS LOANS].Account, [TDS Escrow Projections].ComputationPeriodStartingDate, [TDS LOANS].LastName, [TDS LOANS].Categories
    FROM [TDS Escrow Projections] INNER JOIN [TDS LOANS] ON [TDS Escrow Projections].LoanRecID = [TDS LOANS].RecID
    WHERE ((([TDS LOANS].PrinBal)<>0))
    ORDER BY [TDS LOANS].Account, [TDS Escrow Projections].ComputationPeriodStartingDate DESC
) 
    as a
        INNER JOIN
        (
SELECT Account, MAX(ComputationPeriodStartingDate) as max_date
        FROM
    (SELECT [TDS LOANS].Account, [TDS Escrow Projections].ComputationPeriodStartingDate, [TDS LOANS].LastName, [TDS LOANS].Categories
    FROM [TDS Escrow Projections] INNER JOIN [TDS LOANS] ON [TDS Escrow Projections].LoanRecID = [TDS LOANS].RecID
    WHERE ((([TDS LOANS].PrinBal)<>0))
    ORDER BY [TDS LOANS].Account, [TDS Escrow Projections].ComputationPeriodStartingDate DESC
)
        GROUP BY Account) as b
        ON a.Account=b.Account AND a.ComputationPeriodStartingDate = b.max_date

对于每个Account，子查询将返回ComputationPeriodStartingDate 的最大值。然后我们将它与Account 和max_date 上的表格连接起来。

注意：您没有提到表名。因此相应地更新表名。