Question

How can I add two text row on same column, or any alternative aggregate function which can apply sum() on text columns.

id       Name       
1          A        
1          B        
2          C        

group by id

result like this.

id  Names
1   A,B
2   C

Answer 1

Try this:

declare @t table(id int, name varchar(50))

insert @t values(1, 'A')
insert @t values(1, 'B')
insert @t values(2, 'C')


select t.id, 
    ,STUFF(( 
        select ',' + [name] 
        from @t t1 
        where t1.id = t.id 
        for xml path(''), type 
    ).value('.', 'varchar(max)'), 1, 1, '') [Names] 
from @t t 
group by t.id 

Result:

id          Names
----------- --------------
1           A,B
2           C