concatenate column values separated by comma in sql code example

Example 1: sql server: how to concatenate column data using comma

DECLARE @SQL AS VARCHAR(8000)
SELECT @SQL = ISNULL(@SQL+',','') + ColumnName FROM TableName
SELECT @SQL

Example 2: sql server: how to concatenate column data using comma

declare @aa varchar (200)
set @aa = ''

select @aa = 
    case when @aa = ''
    then CarName
    else @aa + coalesce(',' + CarName, '')
    end
  from Cars

print @aa

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