Sql server 2005 TSQL查找重复项

查找具有计数的重复行

假设给出了一张表

  ID  Name      Age
  ----------------- 
  1   Jon       30
  2   Skeet     30 
  1   Jon       30
  4   Gravell   30
  5   NULL      30 
  4   Gravell   30
  5   NULL      30 
  7   James     40 

所需输出（空值也应可比较）

为了查找重复项，我可以执行查询

select ID,Name,Age from tableA  group by ID,Name,Age having count(*) >1

如何生成描述？

试试这个-

select ID,Name,Age, ('Found ' +  cast(count(*) as varchar(5))) as description
from tableA  group by ID,Name,Age having count(*) >1 

所需的输出顺序在ID/Name级别基本上是随机的

要查找重复项

SELECT
    ID, Name, Age, 'Found ' + Countof AS Description
FROM
    (
    SELECT
        ID, Name, Age,
        CAST(ROWNUMBER() OVER (PARITION BY Name ORDER BY ID) AS varchar(10)) AS Countof
    FROM
        MyTable
    ) foo
WHERE
    Countof > 1

---

我不太明白。你怎么能让1-Jon-30找到1，然后1-Jon-30找到2。1-Jon-30-find 2不是唯一的记录吗（作为计数）

SELECT
    ID, Name, Age,
    'Found ' + CAST(ROWNUMBER() OVER (PARITION BY Name ORDER BY ID) AS varchar(10)) AS Description
FROM
    MyTable
ORDER BY
    ID, Description

SELECT
    ID, Name, Age, 'Found ' + Countof AS Description
FROM
    (
    SELECT
        ID, Name, Age,
        CAST(ROWNUMBER() OVER (PARITION BY Name ORDER BY ID) AS varchar(10)) AS Countof
    FROM
        MyTable
    ) foo
WHERE
    Countof > 1