Question

I would like to identify occurences where there are more than 1 distinct value of an E,F column combination within an A,B,C,D grouping.

For example, given the following data:

SELECT * FROM MyTable   

A          B          C          D          E          F
---------- ---------- ---------- ---------- ---------- ----------
1          1          1          1          A          B         
1          1          1          1          A          B         
1          1          1          2          A          C         
1          1          1          2          A          D  

I want to return

A          B          C          D          
---------- ---------- ---------- ----------     
1          1          1          2         

..because there ar multiple distinct (E,F) combinations within that (A,B,C,D) grouping).

Here’s teh SQL to create your test case!

CREATE TABLE [dbo].[MyTable](
    [A] [nchar](10) NULL,
    [B] [nchar](10) NULL,
    [C] [nchar](10) NULL,
    [D] [nchar](10) NULL,
    [E] [nchar](10) NULL,
    [F] [nchar](10) NULL
) ON [PRIMARY]

GO
INSERT INTO [dbo].[MyTable]([A], [B], [C], [D], [E], [F])
SELECT N'1         ', N'1         ', N'1         ', N'1         ', N'A         ', N'B         ' UNION ALL
SELECT N'1         ', N'1         ', N'1         ', N'1         ', N'A         ', N'B         ' UNION ALL
SELECT N'1         ', N'1         ', N'1         ', N'2         ', N'A         ', N'C         ' UNION ALL
SELECT N'1         ', N'1         ', N'1         ', N'2         ', N'A         ', N'D         '

Answer 1

SELECT
    A,B,C,D
FROM
    (
    SELECT
        A,B,C,D,
        ROW_NUMBER() OVER (PARTITION BY A,B,C,D,E,F ORDER BY (SELECT 1)) AS DistinctTuplesLong,
        ROW_NUMBER() OVER (PARTITION BY A,B,C,D ORDER BY (SELECT 1)) AS DistinctTuples
    FROM
        Mytable
    ) T
WHERE 
    DistinctTuplesLong < DistinctTuples

Edit: used wrong windowing function

Edit 2: clearer now with sample data