tsql join multiple record in one string code example

Example 1: tsql join multiple record in one string

Select CountryName from Application.Countries 
 
Declare @val Varchar(MAX); 
Select @val = COALESCE(@val + ', ' + CountryName, CountryName) 
        From Application.Countries Select @val;

Example 2: tsql join multiple record in one string

-- Concatenates results into one single varchar with separator
SELECT LISTAGG(column_name, ',') WITHIN GROUP (ORDER BY column_name)
FROM YOUR_TABLE;