Question

我在下面有这个t-sql脚本，我需要修改它以确保table1中没有重复的行。我想通过抓取[ImportedDate]列中具有最新日期的行来实现这一点。我能得到一些指导吗？感谢

澄清更新我需要选择table1中匹配table2的所有行。但是，每个表中都有多个记录实例。所以我还需要确保我只从table1中为每个[MIN]数字（最新版本）提取1条记录。因此，例如当前的结果集是20008条记录，我应该通过清除重复项来获得比这更小的地方。我认为它需要一个内在的选择。

SELECT  mr.Id
       ,mr.F2FResolved
       ,mr.F2FIgnore
       ,mr.[F2FIgnore Always]
       ,REPLACE(LTRIM(RTRIM([MIN])), '-', '') AS [MIN]
       ,LTRIM(RTRIM(mr.BorrowerLastName)) AS BorrowerLastName
       ,LTRIM(RTRIM(mr.BorrowerFirstName)) AS BorrowerFirstName
       ,LTRIM(RTRIM(mr.BorrowerSSN)) AS BorrowerSSN
       ,LTRIM(RTRIM(mr.PropertyStreet)) AS PropertyStreet
       ,LTRIM(RTRIM(mr.PropertyZip)) AS PropertyZip
       ,LTRIM(RTRIM(mr.NoteAmount)) AS NoteAmount
       ,LTRIM(RTRIM(mr.LienType)) AS LienType
FROM    table1 mr
        INNER JOIN table2 d ON LTRIM(RTRIM(MERSMin)) = REPLACE(LTRIM(RTRIM(mr.[MIN])), '-', '')
WHERE   ( ( ( mr.[F2FResolved] IS NULL
              OR mr.[F2FResolved] = 0
            )
            AND ( d.[F2FResolved] IS NULL
                  OR d.[F2FResolved] = 0
                )
          )
          OR ( ( mr.[F2FIgnore Always] IS NULL
                 OR mr.[F2FIgnore Always] = 0
               )
               AND d.[F2FIgnore Always] IS NULL
               OR d.[F2FIgnore Always] = 0
             )
          OR ( ( mr.[F2FIgnore] IS NULL
                 OR mr.[F2FIgnore] = 0
               )
               AND d.[F2FIgnore] IS NULL
               OR d.[F2FIgnore] = 0
             )
        )
        AND ( ( mr.[F2FProcessed] IS NULL
                OR mr.[F2FProcessed] = 0
              )
              AND ( d.[F2FProcessed] IS NULL
                    OR d.[F2FProcessed] = 0
                  )
            )

在图像中，您将看到Id = 65759和52413是针对同一个人的。我只需要检索65759记录，因为它具有最新的导入日期。

enter image description here

Answer 1

添加

ORDER BY [ImportedDate] DESC

到查询的底部。

Answer 2

您需要子查询才能获取最新日期。我更喜欢CTE，因为它使代码更清晰。

通过在所有检查中使用coalesce()，无论是零还是空，您还可以使事情变得更简单。

with latestdate (latest) as (
   select max([ImportedDate]) from table1
)
SELECT  mr.Id
       ,mr.F2FResolved
       ,mr.F2FIgnore
       ,mr.[F2FIgnore Always]
       ,REPLACE(LTRIM(RTRIM([MIN])), '-', '') AS [MIN]
       ,LTRIM(RTRIM(mr.BorrowerLastName)) AS BorrowerLastName
       ,LTRIM(RTRIM(mr.BorrowerFirstName)) AS BorrowerFirstName
       ,LTRIM(RTRIM(mr.BorrowerSSN)) AS BorrowerSSN
       ,LTRIM(RTRIM(mr.PropertyStreet)) AS PropertyStreet
       ,LTRIM(RTRIM(mr.PropertyZip)) AS PropertyZip
       ,LTRIM(RTRIM(mr.NoteAmount)) AS NoteAmount
       ,LTRIM(RTRIM(mr.LienType)) AS LienType
FROM    table1 mr
INNER JOIN latestdate ON [ImportedDate] = latest
INNER JOIN table2 d ON LTRIM(RTRIM(MERSMin)) = REPLACE(LTRIM(RTRIM(mr.[MIN])), '-', '')
WHERE   (
          (      coalesce(mr.[F2FResolved],0) = 0
             AND coalesce(d.[F2FResolved] ,0) = 0
          )
          OR (     coalesce(mr.[F2FIgnore Always],0) = 0
               AND coalesce(d.[F2FIgnore Always] ,0) = 0
             )
          OR (     coalesce(mr.[F2FIgnore],0) = 0
               AND coalesce(d.[F2FIgnore] ,0) = 0
             )
        )
        AND coalesce(mr.[F2FProcessed],0) = 0
        AND coalesce(d.[F2FProcessed] ,0) = 0

Answer 3

更新了所有正在寻找的答案。

仅供参考：我知道内部选择中存在无关代码，但此语句是从c＃应用程序动态生成的，其中用户可以选择要查看的列。所以列选择代码只生成一次并添加到string.Format语句两次以输出格式化的sql语句。

SELECT DISTINCT mr.Id
       ,mr.F2FResolved
       ,mr.F2FIgnore
       ,mr.[F2FIgnore Always]
       ,REPLACE(LTRIM(RTRIM([MIN])), '-', '') AS [MIN]
       ,LTRIM(RTRIM(mr.BorrowerLastName)) AS BorrowerLastName
       ,LTRIM(RTRIM(mr.BorrowerFirstName)) AS BorrowerFirstName
       ,LTRIM(RTRIM(mr.BorrowerSSN)) AS BorrowerSSN
       ,LTRIM(RTRIM(mr.PropertyStreet)) AS PropertyStreet
       ,LTRIM(RTRIM(mr.PropertyZip)) AS PropertyZip
       ,LTRIM(RTRIM(mr.NoteAmount)) AS NoteAmount
       ,LTRIM(RTRIM(mr.LienType)) AS LienType
FROM    ( SELECT    mr.Id
                   ,mr.F2FResolved
                   ,mr.F2FIgnore
                   ,mr.[F2FIgnore Always]
                   ,REPLACE(LTRIM(RTRIM(mr.[MIN])), '-', '') AS [MIN]
                   ,LTRIM(RTRIM(mr.BorrowerLastName)) AS BorrowerLastName
                   ,LTRIM(RTRIM(mr.BorrowerFirstName)) AS BorrowerFirstName
                   ,LTRIM(RTRIM(mr.BorrowerSSN)) AS BorrowerSSN
                   ,LTRIM(RTRIM(mr.PropertyStreet)) AS PropertyStreet
                   ,LTRIM(RTRIM(mr.PropertyZip)) AS PropertyZip
                   ,LTRIM(RTRIM(mr.NoteAmount)) AS NoteAmount
                   ,LTRIM(RTRIM(mr.LienType)) AS LienType
                   ,mr.F2FProcessed
                   ,ROW_NUMBER() OVER ( PARTITION BY mr.[MIN] ORDER BY mr.[ImportedDate] DESC ) AS rn
          FROM      Table1 mr
        ) AS mr
        INNER JOIN Table2 d ON LTRIM(RTRIM(MERSMin)) = REPLACE(LTRIM(RTRIM(mr.[MIN])), '-', '')
WHERE   ( ( COALESCE(mr.[F2FResolved], 0) = 0
            AND COALESCE(d.[F2FResolved], 0) = 0
          )
          OR ( COALESCE(mr.[F2FIgnore Always], 0) = 0
               AND COALESCE(d.[F2FIgnore Always], 0) = 0
             )
          OR ( COALESCE(mr.[F2FIgnore], 0) = 0
               AND COALESCE(d.[F2FIgnore], 0) = 0
             )
        )
        AND COALESCE(mr.F2FProcessed, 0) = 0
        AND COALESCE(d.F2FProcessed, 0) = 0
        AND rn = 1

从具有最快导入日期的表中选择行

3 个答案: