按创建日期 SQL 查找重复项

Question

我正在尝试在单个表中查找重复项，其中至少有一个重复项是在最后一天创建的。

这是我的查询：

SELECT DateOfBirth DOB, 
    FirstName FirstName, 
    LastName LastName, 
    COUNT(*) TotalCount
FROM TABLE
WHERE DateOfBirth IS NOT NULL
    AND DATEDIFF(d,dateCreated,getDate()) <= 1
GROUP BY DateofBirth, FirstName, LastName
HAVING COUNT(*) > 1
ORDER BY COUNT(*) DESC

问题是这个查询没有返回任何内容，因为这两个副本都需要在最后一天创建（读取方式）。

我做了一些测试，发现这个 datediff 要求 dateCreated 列都在 datediff 内。

有什么方法可以把这些重复的最近的重复在最后一天创建的地方带回来？即使最旧的副本是在一年前创建的？

Answer 1

;WITH x AS 
(
  SELECT FirstName, LastName, DateOfBirth, DateCreated, 
    TotalCount = COUNT(*) OVER
    (
      PARTITION BY FirstName, LastName, DateOfBirth
    )
  FROM dbo.[TABLE]
)
SELECT FirstName, LastName, DateOfBirth, DateCreated, TotalCount
  FROM x 
  WHERE TotalCount > 1 
  AND DateCreated >= DATEADD(DAY, -1, CURRENT_TIMESTAMP);

如果您想消除那些在最后一天错误创建的重复项，只需将外部查询更改为：

;WITH x AS 
(
  ...
)
DELETE x WHERE TotalCount > 1 
  AND DateCreated >= DATEADD(DAY, -1, CURRENT_TIMESTAMP);

Answer 2

我已将其修改为 Aarons 答案的替代方案，以防您只想查看不是原始记录的重复项。

   ;WITH x AS 
    (
      SELECT FirstName, LastName, DateOfBirth, DateCreated, 
         Row_number() OVER
        (
          PARTITION BY FirstName, LastName, DateOfBirth
        order by dateCreated) as rowNumber
      FROM dbo.[TABLE1]
    )
    SELECT FirstName, LastName, DateOfBirth, DateCreated, rowNumber
      FROM x 
      WHERE rowNumber > 1 
      AND DateCreated >= DATEADD(DAY, -1, CURRENT_TIMESTAMP); 

Answer 3

如果您只需要查看最新的，您可以通过简单的自加入来摆脱困境：

SELECT t2.*
FROM table t1
INNER JOIN table t2 on t1.DateofBirth = t2.DateofBirth and t1.FirstName = t2.FirstName and t1.Lastname = t2.LastName
WHERE t2.DateCreated <> t1.DateCreated 
   AND t2.DateCreated > DATEADD(d, -1, current_timestamp)

如果您需要查看记录的每个 实例，您可以尝试将t1 和t2 值都放在上面查询的选择列表中。如果您希望它们作为单独的记录，您可以将上述查询作为派生表加入：

SELECT t3.* 
FROM Table t3
INNER JOIN (
    SELECT t2.DateofBirth, t2.FirstName, t2.LastName
    FROM table t1
    INNER JOIN table t2 on t1.DateofBirth = t2.DateofBirth and t1.FirstName = t2.FirstName and t1.Lastname = t2.LastName
    WHERE t2.DateCreated <> t1.DateCreated 
       AND t2.DateCreated > DATEADD(d, -1, current_timestamp)
) sub on t3.DateofBirth = sub.DateofBirth and t3.FirstName = sub.FirstName and t3.Lastname = sub.LastName

Answer 4

这应该可以工作，无需使用 CTE：

SELECT 
     DOB =          t.DateOfBirth
    ,FirstName =    t.FirstName
    ,LastName =     t.LastName
    ,TotalCount =   COUNT(*)

FROM 
    TABLE t
WHERE   
    (NOT t.DateOfBirth IS NULL)
    AND EXISTS
       (
        SELECT * 
        FROM 
            TABLE nt 
        WHERE 
            DATEDIFF(d,nt.dateCreated,getDate()) <= 1 
            AND nt.FirstName = t.FirstName 
            AND nt.LastName = t.LastName
            AND nt.DateOfBirth = t.DateOfBirth
        )
GROUP BY 
    t.DateofBirth
    ,t.FirstName
    ,t.LastName
HAVING 
    COUNT(*) > 1
 ORDER BY 
    COUNT(*) DESC