Problem with sql select query

I'm having a little problem with [PortfelID] column. I need it's ID to be able to use it in function which will return me name about Type of Strategy per client. However by doing this i need to put [PortfelID] in GroupBy which complicates the results a lot.

I'm looking for a wa开发者_如何学编程y to find Type of Strategy and Sum of Money this strategy has. However if i use Group By [PortfelID] I'm getting multiple entries per each strategy. Actually over 700 rows (because there are 700 [PortfelID] values). And all I want is just 1 strategy and Sum of [WycenaWartosc] for this strategy. So in total i would get 15 rows or so

Is there a way to use that function without having to add [PortfelID] in Group By?

DECLARE @data DateTime
SET @data = '20100930'

SELECT [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty] ([PortfelID], @data)
      ,SUM([WycenaWartosc]) AS 'Wycena'   
  FROM[dbo].[Wycena]
  LEFT JOIN [KlienciPortfeleKonta]
  ON [Wycena].[KlienciPortfeleKontaID] = [KlienciPortfeleKonta].[KlienciPortfeleKontaID] 
  WHERE [WycenaData] = @data 
  GROUP BY [PortfelID]

Where [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty] is defined like this:

ALTER FUNCTION [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty]
    (
      @portfelID INT,
      @data DATETIME 
    )
RETURNS NVARCHAR(MAX)
AS BEGIN
    RETURN ( SELECT TOP 1
                    [TypyStrategiiNazwa]
             FROM   [dbo].[KlienciPortfeleUmowy]
                    INNER JOIN [dbo].[TypyStrategii]
                    ON dbo.KlienciPortfeleUmowy.TypyStrategiiID = dbo.TypyStrategii.TypyStrategiiID
             WHERE  [PortfelID] = @portfelID
                    AND ( [KlienciUmowyDataPoczatkowa] <= @data
                          AND ([KlienciUmowyDataKoncowa] >= @data
                          OR KlienciUmowyDataKoncowa IS NULL)
                        )
             ORDER BY [KlienciUmowyID] ASC
           )

   end

EDIT:

As per suggestion (Roopesh Majeti) I've made something like this:

  SELECT SUM(CASE WHEN [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty] ([PortfelID], @data) = 'portfel energetyka' THEN [WycenaWartosc] ELSE 0 END) AS 'Strategy 1'
 ,SUM(CASE WHEN [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty] ([PortfelID], @data) = 'banków niepublicznych' THEN [WycenaWartosc] ELSE 0 END) AS 'Strategy 2'
  FROM [dbo].[Wycena]
  LEFT JOIN [KlienciPortfeleKonta]
  ON [Wycena].[KlienciPortfeleKontaID] = [KlienciPortfeleKonta].[KlienciPortfeleKontaID] 
  WHERE [WycenaData] = @data

But this seems like a bit overkill and a bit too much of hand job is required. AlexS solution seems to do exactly what I need :-)

Here's an idea of how you can do this.

DECLARE @data DateTime
SET @data = '20100930'

SELECT 
   TypID,
   SUM([WycenaWartosc]) AS 'Wycena'
FROM 
(
  SELECT [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty] ([PortfelID], @data) as TypID
  ,[WycenaWartosc]
  FROM[dbo].[Wycena]
  LEFT JOIN [KlienciPortfeleKonta]
  ON [Wycena].[KlienciPortfeleKontaID] = [KlienciPortfeleKonta].[KlienciPortfeleKontaID] 
  WHERE [WycenaData] = @data
) as Q
GROUP BY [TypID]

So basically there's no need to group by PortfelID (as soon as you need to group by output of [dbo].[ufn_TypStrategiiDlaPortfelaDlaDaty]).

This query is not optimal, though. Join can be pushed to the outer query in case PortfelID and WycenaData are not in [KlienciPortfeleKonta] table.

UPDATE: fixed select list and aggregation function application

How about using the "Case" statement in sql ? Check the below link for example : http://www.1keydata.com/sql/sql-case.html

Hope this helps.