sql server pivot : group by with dynamic columns

Question

I have done a pivot on a table, generating dynamic columns :

DECLARE @cols AS NVARCHAR(MAX);
DECLARE @query AS NVARCHAR(MAX);

select @cols = STUFF((SELECT d         


        

Answer 1

DECLARE @cols AS NVARCHAR(MAX);
DECLARE @query AS NVARCHAR(MAX);

select @cols = STUFF((SELECT distinct ',' +
                        QUOTENAME(Replace(variable,char(CAST(0x0016 as int)),'')) val
                      FROM TABLEDATA
                      ORDER BY val asc
                      FOR XML PATH(''), TYPE
                     ).value('.', 'NVARCHAR(MAX)') 
                        , 1, 1, '');

SELECT @query =

'SELECT
  time,
  country,
  disease,
  ' + @cols + '
FROM (
    Select
        time,
        country,
        disease,
        variable,
        convert(decimal(10, 2), value) as value
    From
        TABLEDATA
    ) t
PIVOT 
(
  Sum(value)
  FOR variable IN( ' + @cols + ' )' +
' ) AS p; ';


Execute(@query);

Example Fiddle