我知道这个问题已经回答了，但我已经创建了非常有用的sp，它将为表副本创建一个动态删除语句:

    CREATE PROCEDURE sp_DeleteDuplicate @tableName varchar(100), @DebugMode int =1
AS 
BEGIN
SET NOCOUNT ON;

IF(OBJECT_ID('tempdb..#tableMatrix') is not null) DROP TABLE #tableMatrix;

SELECT ROW_NUMBER() OVER(ORDER BY name) as rn,name into #tableMatrix FROM sys.columns where [object_id] = object_id(@tableName) ORDER BY name

DECLARE @MaxRow int = (SELECT MAX(rn) from #tableMatrix)
IF(@MaxRow is null)
    RAISERROR  ('I wasn''t able to find any columns for this table!',16,1)
ELSE 
    BEGIN
DECLARE @i int =1 
DECLARE @Columns Varchar(max) ='';

WHILE (@i <= @MaxRow)
BEGIN 
    SET @Columns=@Columns+(SELECT '['+name+'],' from #tableMatrix where rn = @i)

    SET @i = @i+1;
END

---DELETE LAST comma
SET @Columns = LEFT(@Columns,LEN(@Columns)-1)

DECLARE @Sql nvarchar(max) = '
WITH cteRowsToDelte
     AS (
SELECT ROW_NUMBER() OVER (PARTITION BY '+@Columns+' ORDER BY ( SELECT 0)) as rowNumber,* FROM '+@tableName
+')

DELETE FROM cteRowsToDelte
WHERE  rowNumber > 1;
'
SET NOCOUNT OFF;
    IF(@DebugMode = 1)
       SELECT @Sql
    ELSE
       EXEC sp_executesql @Sql
    END
END

如果你创建这样的表格

IF(OBJECT_ID('MyLitleTable') is not null)
    DROP TABLE MyLitleTable 


CREATE TABLE MyLitleTable
(
    A Varchar(10),
    B money,
    C int
)
---------------------------------------------------------

    INSERT INTO MyLitleTable VALUES
    ('ABC',100,1),
    ('ABC',100,1), -- only this row should be deleted
    ('ABC',101,1),
    ('ABC',100,2),
    ('ABCD',100,1)

    -----------------------------------------------------------

     exec sp_DeleteDuplicate 'MyLitleTable',0

它将从表中删除所有重复项。如果运行它时不带第二个参数，它将返回一条SQL语句来运行。

如果您需要排除任何列，只需在调试模式下运行它，获取代码并按照您的喜好修改它。

现在让我们看看elasticalsearch表，这个表有重复的行，Id是相同的uniq字段。我们知道如果某个id存在于某个组条件下，那么我们可以删除该组作用域之外的其他行。我的举止表明了这一标准。

很多情况下，这个线程是在类似的状态，我。只需根据删除重复(重复)行的情况更改目标组条件。

DELETE 
FROM elasticalsearch
WHERE Id NOT IN 
               (SELECT min(Id)
                     FROM elasticalsearch
                     GROUP BY FirmId,FilterSearchString
                     ) 

干杯

这将删除重复的行，除了第一行

DELETE
FROM
    Mytable
WHERE
    RowID NOT IN (
        SELECT
            MIN(RowID)
        FROM
            Mytable
        GROUP BY
            Col1,
            Col2,
            Col3
    )

引用(http://www.codeproject.com/Articles/157977/Remove-Duplicate-Rows-from-a-Table-in-SQL-Server)

哦,当然。使用临时表。如果你想要一个“工作”的单一的、性能不太好的语句，你可以使用:

DELETE FROM MyTable WHERE NOT RowID IN
    (SELECT 
        (SELECT TOP 1 RowID FROM MyTable mt2 
        WHERE mt2.Col1 = mt.Col1 
        AND mt2.Col2 = mt.Col2 
        AND mt2.Col3 = mt.Col3) 
    FROM MyTable mt)

基本上，对于表中的每一行，子选择将查找与所考虑行的完全相同的所有行的顶部RowID。因此，您最终会得到一个表示“原始”非重复行的RowIDs列表。

DELETE LU 
FROM   (SELECT *, 
               Row_number() 
                 OVER ( 
                   partition BY col1, col1, col3 
                   ORDER BY rowid DESC) [Row] 
        FROM   mytable) LU 
WHERE  [row] > 1 

我更喜欢子查询\having count(*) > 1解决方案内部连接，因为我发现它更容易阅读，它很容易变成一个SELECT语句来验证什么将被删除，然后再运行它。

--DELETE FROM table1 
--WHERE id IN ( 
     SELECT MIN(id) FROM table1 
     GROUP BY col1, col2, col3 
     -- could add a WHERE clause here to further filter
     HAVING count(*) > 1
--)