Question

到目前为止，我已经使用了以下SQL代码。

DECLARE @Table1 TABLE (ID INT Identity (1,1), Col1 varchar(50), Col2 varchar(50))
INSERT INTO @Table1 (Col1, Col2)
VALUES ('CAN','ABCD'),('CAN','ABCE'),('CAN','MNPP'),('CAN','MNPP'),('EDG','MNPP')

DECLARE @Table2 TABLE (ID INT Identity (1,1), Col2 varchar(50), Col3 varchar(50))
INSERT INTO @Table2 (Col2, Col3)
VALUES ('ABCD','ABC'),('ABCE','ABC'),('MNPP','MNO')

;WITH TEST_CTE AS
(
SELECT T1.ID
       , T1.Col1, T1.Col2 AS T1Col2, T2.Col2 AS T2Col2, T2.Col3
       , ROW_NUMBER() OVER (PARTITION BY T1.Col1, T2.Col3 ORDER BY T1.ID) AS DuplicateRowNumber
       , CASE WHEN COUNT(*) OVER (PARTITION BY T1.Col1, T2.Col3) > 1 THEN 1 ELSE 0 END IsMulitple
 FROM @Table1 T1 INNER JOIN @Table2 T2 ON T1.Col2 = T2.Col2
)

SELECT * FROM TEST_CTE

我正在

ID  Col1    T1Col2  T2Col2  Col3    DuplicateRowNumber  IsMulitple
1   CAN     ABCD    ABCD    ABC     1                   1
2   CAN     ABCE    ABCE    ABC     2                   1
3   CAN     MNPP    MNPP    MNO     1                   1
4   CAN     MNPP    MNPP    MNO     2                   1
5   EDG     MNPP    MNPP    MNO     1                   0

我期待

ID  Col1    T1Col2  T2Col2  Col3    DuplicateRowNumber  IsMulitple
1   CAN     ABCD    ABCD    ABC     1                   1
2   CAN     ABCE    ABCE    ABC     2                   1
3   CAN     MNPP    MNPP    MNO     1                   0
4   CAN     MNPP    MNPP    MNO     1                   0
5   EDG     MNPP    MNPP    MNO     1                   0

我的目标：只有当我有多个记录时，我的副本才会被查询，其中T1.Col1和T2.Col3值相同但是T1.Col2值不同。

谢谢

更新：让IsMultiple工作。无法找出DuplicateRowNumber

更新2：nvm以前的更新，对实时数据不起作用。

Answer 1

或许这样的事情：

;with cte as
(
select t1.id, t1.col1, t1.col2, t2.col3, dense_rank() over(partition by t1.col1, t2.col3 order by t1.col2) DuplicateRowNumber
from @table1 t1 
join @table2 t2 on t1.col2 = t2.col2
)
select *, sign(max(DuplicateRowNumber) over (partition by col1, col3)-1) Ismultiple
from cte

Fiddle

T / SQL - 带有扭曲的副本的QUERY

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