如何使用SQL审计跟踪查找已销毁的数据行

我使用一个审计表来查找哪些内容记录了在上运行的单个破坏性SQL语句，例如“2011-01-01 08:00:00.000”。您可以假设每个MyTable记录在脚本运行的当天只更新了一次。此SQL可能由用户运行，无法检索。每当MyTable发生更改时，新值的审核跟踪就会存储在AuditMyTable中

我的原始表架构：

MyTable(AccountId int PK, Amount int)

AuditMyTable(AccountId int, Amount int, AuditDate datetime)

MyTable架构的我的审核跟踪表：

MyTable(AccountId int PK, Amount int)

AuditMyTable(AccountId int, Amount int, AuditDate datetime)

我的问题是，如何从AuditMyTable针对自身编写SQL联接，以便返回以下数据：

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AuditMyTable.AccountId，AuditMyTable.Amount为[NullAmount]，AuditMyTablePrevious.Amount为[PreviousNotNullAmount]

首先，您必须从您的日期中获取我正在创建的序列，假设它们严格增加：

SELECT AccountId, cur.AuditDate AS cur_AuditDate, MAX(prev.AuditDate) AS prev_AuditDate
FROM AuditMyTable AS cur
LEFT JOIN AuditMyTable AS prev
    ON prev.AccountId = cur.AccountId
    AND prev.AuditDate < cur.AuditDate
GROUP BY AccountId, cur.AuditDate

然后使用它：

WITH Ordering AS (
    SELECT AccountId, cur.AuditDate AS cur_AuditDate, MAX(prev.AuditDate) AS prev_AuditDate
    FROM AuditMyTable AS cur
    LEFT JOIN AuditMyTable AS prev
        ON prev.AccountId = cur.AccountId
        AND prev.AuditDate < cur.AuditDate
    GROUP BY AccountId, cur.AuditDate
)
SELECT cur.AccountId, cur.Amount as [NullAmount], prev.Amount as [PreviousNotNullAmount]
FROM AuditMyTable AS cur
INNER JOIN Ordering
    ON Ordering.AccountId = cur.AccountId
    AND Ordering.cur_AuditDate = cur.Audit_Date
LEFT JOIN AuditMyTable AS prev
    ON prev.AccountId = cur.AccountId
    AND prev.Audit_Date = Ordering.prev_AuditDate

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您只对已知时间内的一条特定记录或整个表感兴趣？本质上，您试图发现一个记录PK列表，该列表在SQL运行之前具有一个值，然后在SQL运行时变为null。