Flatten table rows into columns in SQL Server [duplicate]

Answer 1

to do dynamic pivot I did it a long way back.

UPDATED: Made more close to your code and talble names.

This will work for however many columns you want for the PIVOT, doesnt matter if 1 or 20

DECLARE @SelectFieldNameList as varchar(8000)
DECLARE @SelectFieldNameListCount as varchar(8000)
Set @SelectFieldNameList = ''
Set @SelectFieldNameListCount = ''

-- this section selects the list of firm location names and puts them in a string to be used in the pivot
-- it does it for the field select list and the count select using ISNULL so it puts a 0 if no counts returned
SELECT top (999999) @SelectFieldNameList = @SelectFieldNameList + case when @SelectFieldNameList = '' then '' else ', ' end 
+ '[' + Data + ']', 
@SelectFieldNameListCount = @SelectFieldNameListCount + case when @SelectFieldNameListCount = '' then '' else ', ' end 
+ 'ISNULL([' + Data + '], ''0'')' + Data 
From TableName
Where Data IS NOT NULL AND Ltrim(Data) <> ''
Group by Data

-- just for testing
select @SelectFieldNameList, @SelectFieldNameListCount


-- NOW USE THE ABOVE TO get the data pivoted with your dyanic fields
EXEC('
SELECT [Code], ' + @SelectFieldNameListCount + '
FROM (  
    SELECT [Code], Data, Sum(CountTotal) as CountTotal
    From TableName
    Group by [Code], Data
) AS TableToBePivoted
PIVOT (  
    SUM(CountTotal) 
    FOR Data IN (' + @SelectFieldNameList + ')  
) AS PivotedTable
order by [Code];  
')

Answer 2

I would use conditional aggregate along with row_number():

select code,
       max(case when seqnum = 1 then code end) as code_1,
       max(case when seqnum = 2 then code end) as code_2,
       max(case when seqnum = 3 then code end) as code_3
from (select t.*,
             row_number() over (partition by code order by data) as seqnum
      from t
     ) t
group by code;

Answer 3

If you have a know or maximum number of desired columns, you can do a simple PIVOT, otherwise, you would need to go DYNAMIC

Example

 Select *
  From (
        Select [Code]
              ,[Data]
              ,[Col] = concat('Data',Row_Number() over (Partition By [Code] Order by 1/0))
         From  YourTable
       ) src
 Pivot (max([Data]) for [Col] in ([Data1],[Data2],[Data3],[Data4],[Data5])) pvt

Returns

Code        Data1   Data2   Data3   Data4   Data5
SL Payroll  22      33      43      NULL    NULL