Question

Here is my Database structure :

I want to display data like the following :

How can I do it ? Should I use pivot?

Answer 1

You can use PIVOT for this. There are two ways to do this with PIVOT, either a Static Pivot where you code the columns to transform or a Dynamic Pivot which determines the columns at execution.

Static Pivot:

select *
from
(
  select dt, username, product,
    'product' 
      + cast(row_number() 
               over(partition by username order by product) as varchar(10)) productNum
  from yourtable
) x
pivot
(
  min(product)
  for productNum in ([product1], [product2], [product3])
) p
order by dt

See SQL Fiddle with Demo

Dynamic Pivot:

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

select @cols = 
    STUFF((SELECT distinct ',' + Quotename('product' 
              + cast(row_number() 
               over(partition by username order by product) as varchar(10)))
             from yourtable
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

set @query 
    = 'SELECT dt, username,' + @cols + ' from 
       (
        select dt, username, product,
           ''product''
            + cast(row_number() 
               over(partition by username order by product) as varchar(10)) productNum
        from yourtable
       ) x
       pivot 
       (
          min(product)
          for productNum in (' + @cols + ')
       ) p 
        order by dt'

execute(@query)

See SQL Fiddle with Demo