你能帮我用SQL语句在多个字段上找到重复吗?

例如,在伪代码中:

select count(field1,field2,field3) 
from table 
where the combination of field1, field2, field3 occurs multiple times

从上面的语句中,如果有多次出现,我想选择除第一个之外的每一个记录。


当前回答

这是我喜欢的一个有趣的SQL Server 2005解决方案。我将假设“对于除第一条记录外的每条记录”,您的意思是还有另一个“id”列,我们可以使用它来确定哪一行是“第一行”。

SELECT id
    , field1
    , field2
    , field3
FROM
(
    SELECT id
        , field1
        , field2
        , field3
        , RANK() OVER (PARTITION BY field1, field2, field3 ORDER BY id ASC) AS [rank]
    FROM table_name
) a
WHERE [rank] > 1

其他回答

试试这个查询,每个SELECT语句都有一个单独的计数:

select field1, count(field1) as field1Count, field2,count(field2) as field2Counts, field3, count(field3) as field3Counts
from table_name
group by field1, field2, field3
having count(*) > 1

这是我喜欢的一个有趣的SQL Server 2005解决方案。我将假设“对于除第一条记录外的每条记录”,您的意思是还有另一个“id”列,我们可以使用它来确定哪一行是“第一行”。

SELECT id
    , field1
    , field2
    , field3
FROM
(
    SELECT id
        , field1
        , field2
        , field3
        , RANK() OVER (PARTITION BY field1, field2, field3 ORDER BY id ASC) AS [rank]
    FROM table_name
) a
WHERE [rank] > 1

你也可以尝试这个查询来计数一个不同的()列,并根据你想要的列进行排序:

select field1, field2, field3, count(distinct (field2))
from table_name
group by field1, field2, field3
having count(field2) > 1
order by field2;

CREATE TABLE #tmp
(
    sizeId Varchar(MAX)
)

INSERT  #tmp 
    VALUES ('44'),
        ('44,45,46'),
        ('44,45,46'),
        ('44,45,46'),
        ('44,45,46'),
        ('44,45,46'),
        ('44,45,46')


SELECT * FROM #tmp
DECLARE @SqlStr VARCHAR(MAX)

SELECT @SqlStr = STUFF((SELECT ',' + sizeId
              FROM #tmp
              ORDER BY sizeId
              FOR XML PATH('')), 1, 1, '') 


SELECT TOP 1 * FROM (
select items, count(*)AS Occurrence
  FROM dbo.Split(@SqlStr,',')
  group by items
  having count(*) > 1
  )K
  ORDER BY K.Occurrence DESC    

要查看重复值:

with MYCTE  as (
    select row_number() over ( partition by name  order by name) rown, *
    from tmptest  
    ) 
select * from MYCTE where rown <=1