Merge 2 rows values in SQL

Create a table called <UserAliases>

CREATE TABLE UserAliases

(

UserID int,

alias varchar(50)

)

GO

Insert some records into  table <UserAliases>.

insert into UserAliases(UserID,Alias)

values(1,'Aliases1')

insert into UserAliases(UserID,Alias)

values(1,'Aliases2')

insert into UserAliases(UserID,Alias)

values(2,'Aliases3')

insert into UserAliases(UserID,Alias)

values(3,'Aliases4')

insert into UserAliases(UserID,Alias)

values(4,'Aliases5')

insert into UserAliases(UserID,Alias)

values(2,'Aliases6')

insert into UserAliases(UserID,Alias)

values(3,'Aliases7')

GO

Create a function :

CREATE FUNCTION [dbo].[GetAliasesById]

(

    @userID int

)

RETURNS varchar(max)

AS

BEGIN

    declare @output varchar(max)

    select @output = COALESCE(@output + ', ', '') + alias

    from UserAliases

    where userid = @userID

    return @output

END

GO

SELECT UserID, dbo.GetAliasesByID(UserID) As AliasName

FROM UserAliases

GROUP BY UserID

The result looks like this

UserID AliasesName

1 Aliases1, Aliases2

2 Aliases3, Aliases6

3 Aliases4, Aliases7

4 Aliases5

Happy coding.