comma separated row values in sql server code example

Example 1: convert rows to string sql server

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

Example 2: rows to comma separated values in mssql

DECLARE @test NVARCHAR(max)  
SELECT @test = COALESCE(@test + ',', '') + field2 FROM #test
SELECT field2 = @test

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