I want to write SQL query to get group of result.

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HTML

Table
Column1	Column2
a	      1
a	      2
a	      3
a	      4
a	      5
a	      6
a	      7
a	      8
a	      9
a	      10

HTML

 Required OUT PUT: 
Column1	Column2
a	       1,2,3,4,5
a	        6,7,8,9,10

What I have tried:

I have tried to get below result using sql server but don't get excepted result.
Please help.

Posted 20-Feb-17 23:20pm

suneel kumar gupta

Updated 20-Feb-17 23:30pm

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Maciej Los · Answer 1 · 2017-02-20T23:30:00

Check this:
sql - Concatenate many rows into a single text string? - Stack Overflow[^]
sql - Multiple rows to one comma-separated value - Stack Overflow[^]

[EDIT]
I forgot to mentiond that you need to use NTILE(2)[^] function to be able to split Column1 into 2 groups, before you start concatenating Column2:

SQL

SELECT *, NTILE(2) OVER( ORDER BY Column1) AS GrpNo
FROM YourTableName

Complete example:

SQL

DECLARE @tmp TABLE (Column1 VARCHAR(5),	Column2 INT)

INSERT INTO @tmp (Column1, Column2)
VALUES('a', 1),
('a', 2),
('a', 3),
('a', 4),
('a', 5),
('a', 6),
('a', 7),
('a', 8),
('a', 9),
('a', 10)

SELECT DISTINCT t2.Column1, 
    (
        SELECT CONVERT(VARCHAR(100), t1.Column2) + ',' AS [text()]
        From (
			SELECT *, NTILE(2) OVER( ORDER BY Column1) AS GrpNo
			FROM @tmp
		) t1
        WHERE t1.Column1  = t2.Column1 AND t1.GrpNo = t2.GrpNo
        FOR XML PATH ('')
    ) AS Col2
FROM (
	SELECT *, NTILE(2) OVER( ORDER BY Column1) AS GrpNo
	FROM @tmp
	) AS t2