TSQL- csv for a column and not for the rest

Question

i need to get csv from a column but the minimum value from the rest of the columns (or any value because they are same for a group). As an example;

I have the following

Answer 1

You can do it with a sub query, like this:

Create and populate sample table (Please save us this step in your future questions)

DECLARE @T AS TABLE
(
    COL1 char(3),
    COL2 int,
    COL3 int,
    COL4 char(6)
)

INSERT INTO @T VALUES
('ABC', 10, 35, 'GROUP1'),
('AQW', 10, 35, 'GROUP1'),
('VBN', 10, 35, 'GROUP1'),
('HJK', 10, 35, 'GROUP1'),
('DFV', 30, 25, 'GROUP2'),
('HYT', 30, 25, 'GROUP2'),
('DET', 30, 25, 'GROUP2')

The query:

SELECT DISTINCT
       STUFF(
       (
           SELECT ',' + COL1
           FROM @T
           WHERE COL2 = t.COL2
           AND COL3 = t.COL3
           AND COL4 = t.COL4
           FOR XML PATH('')
       )
       , 1, 1, '') As COL1,
       COL2,
       COL3,
       COL4
 FROM @T t

Results:

COL1                COL2    COL3    COL4
ABC,AQW,VBN,HJK     10      35      GROUP1
DFV,HYT,DET         30      25      GROUP2