T-SQL:“；压缩"；值等于1的行

如果存在具有相同值的行，是否有可能只显示一行

我有以下场景：

ID | A列| B列| C列

1 | 2 |测试| 5

2 | 3 |测试| 6

3 | 2 |测试| 5

在此场景中，我只想显示以下结果集：

ID | A列| B列| C列

1 | 2 |测试| 5

2 | 3 |测试| 6

谢谢你的帮助

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尊敬的pro，由于id列的原因，您的行不是完全重复的。如果您不在乎id的哪个值出现，您可以按如下方式执行操作：

select max(id) as id, ColumnA, ColumnB, ColumnC
from t
group by ColumnA, ColumnB, ColumnC

如果您根本不需要id，那么这更简单：

select distinct ColumnA, ColumnB, ColumnC
from t

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?!@JNK支架丢失。现在已更正！当我打开这个问题时，没有任何答案！令人惊讶的是，在我写剧本并粘贴到这里的时候，看到了这么多答案。

Try this :

With cte As
( Select  * , row_number() over (partition by ColumnA, ColumnB,ColumnC
 order by ID ) as myrownumber from myTable
)
Select * from cte where myrownumber=1

select id, column1,column2,colum3 from
(
    select *, row_number() over (partition by column1,column2,colum3 order by id) as sno 
    from table
) as t
where sno=1

CREATE TABLE #test
(
    ID      TINYINT     NOT NULL,
    colA    TINYINT     NOT NULL,
    colB    VARCHAR(10) NOT NULL,
    colC    TINYINT     NOT NULL
);

INSERT INTO #test VALUES (1,2, 'test', 5);
INSERT INTO #test VALUES (2,3, 'test', 6);
INSERT INTO #test VALUES (3,2, 'test', 5);

SELECT 
    ID,
    ColA,
    ColB,
    ColC
FROM 
(   
    SELECT 
        ID,
        ColA,
        ColB,
        ColC,
        ROW_NUMBER() OVER(PARTITION BY ColA ORDER BY ColA DESC) AS RowNum
      FROM #test
) AS WorkTable
WHERE RowNum = 1