Question

关于如何在SQL Server中查找重复的行，Stack Overflow上有无数的示例。但我的目标是：

查找重复项
打印两个，而不只是打印一个

例如，我正在使用此查询在我的数据库中查找具有相同的Street_Number，Street和City的所有交易：

WITH CTE AS
(
    SELECT 
        ROW_NUMBER() OVER (PARTITION BY Street, Street_Number, City ORDER BY Street, Street_Number, City DESC) AS Counting,
        *   
    FROM 
        GoogleDetails 
)
SELECT * 
FROM CTE 
WHERE Counting > 1
ORDER BY Street_Number

但是此查询仅返回一行-我想同时看到它们。

Answer 1

您可以尝试编写一个子查询，以通过COUNT，Street，Street_Number来获得City组，其数量大于1，然后自我加入即可获得期望的行。

SELECT     t2.* 
FROM       ( 
                    SELECT   street, 
                             street_number, 
                             city 
                    FROM     googledetails 
                    GROUP BY street, 
                             street_number, 
                             city 
                    HAVING   Count(*) > 1 ) t1 
INNER JOIN googledetails t2 
ON         t1.street = t2.street 
AND        t1.street_number = t2.street_number
AND        t1.city = t2.city

，或者您可以尝试使用EXISTS进行修改。

SELECT t2.* 
FROM   googledetails t2 
WHERE  EXISTS 
       ( 
                SELECT   1 
                FROM     googledetails t1 
                WHERE    t1.street = t2.street 
                AND      t1.street_number = t2.street_number
                AND      t1.city = t2.city 
                GROUP BY t1.street, 
                         t1.street_number, 
                         t1.city 
                HAVING   count(*) > 1 )

Answer 2

简单来说，您可以尝试用count替换row_number，如下所示：

WITH CTE AS
(
    SELECT 
        Count(*) OVER (PARTITION BY Street, Street_Number, City) AS Counting,
        *   
    FROM 
        GoogleDetails 
)
SELECT * 
FROM CTE 
WHERE Counting > 1
ORDER BY Street_Number

Answer 3

存在但具有不同ID的其他方法，其性能优于使用分组依据：

SELECT f0.* 
FROM   googledetails f0 
WHERE  EXISTS 
(
    select * from googledetails f1 
    where f1.ID<>f0.ID and f1.street = f0.street
    and f1.street_number = f0.street_number and f1.city = f0.city
)

Answer 4

其他方法，交叉应用

SELECT f0.* 
FROM   googledetails f0 
cross apply
(
    select count(*) Counter 
    from googledetails f1 
    where f1.street = f0.street and f1.street_number = f0.street_number and f1.city = f0.city

) f2
where f2.Counter>1

SQL Server：查找重复项，并为它们每个都打印两行

4 个答案: