SQl server duplicate joins issue

问题

can anyone please help: I tried to join with duplicate values but it is not coming as I wanted.

CREATE TABLE #TestTable1 ([No] varchar(50),[Value1] float,[Desc] varchar(50))
insert into #TestTable1 ([No],[Value1],[Desc])
Values 
 (N'123953',427.2,N'Basic Hours')
,(N'123953',106.8,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',105.6,N'Basic Hours')


CREATE TABLE #TestTable2 ([No] varchar(50),[Value2] float,[Desc] varchar(50))
insert into #TestTable2 ([No],[Value2],[Desc])
Values 
 (N'123953',553.02,N'Basic Hours')
,(N'123953',446.67,N'Basic Hours')
,(N'123953',427.2,N'Basic Hours')
,(N'123953',106.8,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',213.6,N'Basic Hours')
,(N'123953',105.6,N'Basic Hours')

Desired Output:

 [No],[Desc],[Value1],[Value2]

 (N'123953',N'Basic Hours',427.2,427.2)
,(N'123953',N'Basic Hours',106.8,106.8)
,(N'123953',N'Basic Hours',213.6,213.6)
,(N'123953',N'Basic Hours',213.6,213.6)
,(N'123953',N'Basic Hours',213.6,213.6)
,(N'123953',N'Basic Hours',213.6,NULL)
,(N'123953',N'Basic Hours',105.6,105.6)

Note: I can't join on Value field for other reasons.

I tried to use row_number() but still not coming as my desired output. Thanks in advance.

回答1:

How does this look?

WITH Table1
AS
(
    SELECT  T1.No,
            T1.[Desc],
            T1.Value1,
            CAST(T1.Value1 AS VARCHAR) + '~' + CAST(ROW_NUMBER() OVER (PARTITION BY T1.No, T1.Value1 ORDER BY T1.Value1 ASC) AS VARCHAR(2)) AS RN
    FROM    @TestTable1 AS T1
),
Table2
AS
(
    SELECT  T2.No,
            T2.[Desc],
            T2.Value2,
            CAST(T2.Value2 AS VARCHAR) + '~' + CAST(ROW_NUMBER() OVER (PARTITION BY T2.No, T2.Value2 ORDER BY T2.Value2 ASC) AS VARCHAR(2)) AS RN
    FROM    @TestTable2 AS T2
)
SELECT  T.No,
        T.[Desc],
        T.Value1,
        T2.Value2
FROM    Table1 AS T
LEFT
JOIN    Table2 AS T2
        ON  T.No = T2.No
            AND T.RN = T2.RN;

回答2:

Here is one way to get your desired output:

;WITH CTE1 AS
(
    SELECT  [No],
            [Value1],
            [Desc], 
            ROW_NUMBER() OVER(PARTITION BY [No], [Value1] ORDER BY @@SPID) As rn
    FROM #TestTable1
),  CTE2 AS
(
    SELECT  [No],
            [Value2],
            [Desc], 
            ROW_NUMBER() OVER(PARTITION BY [No], [Value2] ORDER BY @@SPID) As rn
    FROM #TestTable2
)

SELECT  C1.[No],
        C1.[Desc],
        C1.[Value1],
        C2.[Value2]
FROM CTE1 AS C1
LEFT JOIN CTE2 AS C2
    ON C1.[No] = C2.[No]
    AND C1.rn = C2.rn
    AND C1.[Value1] = C2.[Value2]

来源：https://stackoverflow.com/questions/53411502/sql-server-duplicate-joins-issue

标签

sql-server

tsql

sql-server-2012