Question

I want to call the Stored Procedure which returns a table in the Table Valued Function. How to create the Table Valued Function?

For Example: “sp_GetTable” is the Stored procedure. It returns a table.
Here, I want to write one function called “fn_GetTable”

I want to get the same result which has given by Stored Procedure.

Here is my Stored Procedure:

ALTER PROC sp_GetTable
AS
BEGIN

------------ Creating TempTable(#MasterTable) ----------------------
    CREATE TABLE #MasterTable
    (ItemID INT, ItemName VARCHAR(100), Specifications VARCHAR(100), D1 VARCHAR(50),   D2 VARCHAR(50), D3 VARCHAR(50), 
        D1_Code VARCHAR(50), D2_Code VARCHAR(50), D3_Code VARCHAR(50))

------------ Creating TempTable(#TempItems) ----------------------

    CREATE TABLE #TempItems(ItemID INT, ItemName VARCHAR(100), Specifications VARCHAR(100), D1 VARCHAR(50), D2 VARCHAR(50), D3 VARCHAR(50),
                 D1_Code VARCHAR(50), D2_Code VARCHAR(50), D3_Code VARCHAR(50))
------------ Creating & Inserting TempTable(@Dim) ----------------------

    DECLARE @Dim TABLE (DCodes VARCHAR(100))
    INSERT INTO @Dim SELECT  D1_Code FROM MAS_SizeType WHERE  D1_Code <> ''
    INSERT INTO @Dim SELECT  D2_Code FROM MAS_SizeType WHERE  D2_Code <> ''
    INSERT INTO @Dim SELECT  D3_Code FROM MAS_SizeType WHERE  D3_Code <> ''

------------ Inserting data into TempTable(#MasterTable) ----------------------

    INSERT INTO #MasterTable
    SELECT     STR_Item.ItemID, STR_Item.ItemName, STR_Item_Specifications.SpecificationName, 
        STR_Item.D1, STR_Item.D2, STR_Item.D3, MAS_SizeType.D1_Code, MAS_SizeType.D2_Code, 
                  MAS_SizeType.D3_Code
    FROM         STR_Item INNER JOIN
                  MAS_SizeType ON STR_Item.SizeTypeID = MAS_SizeType.SizeTypeID INNER JOIN
                  STR_Item_Specifications ON STR_Item.SpecificationID = STR_Item_Specifications.SpecificationID

-------------------- Inserting Data into #TempItems Table ----------------------------
INSERT INTO #TempItems
SELECT 
      *
FROM #MasterTable

------------------Cursor for All dimensions details into single row for each items ----------------------

   DECLARE @DCode VARCHAR(MAX), @Cnt INT
   SET @Cnt = 0

   DECLARE ColAdd CURSOR FOR
   SELECT DISTINCT DCodes FROM @Dim
   OPEN ColAdd
   FETCH NEXT FROM ColAdd INTO @DCode
   WHILE (@@FETCH_STATUS = 0)
   BEGIN
  SET @Cnt = 1
  EXECUTE ('ALTER TABLE #TempItems ADD ' + @DCode + ' VARCHAR(50)')
  EXECUTE('UPDATE #TempItems SET [' + @DCode + '] = M.D1
                FROM #MasterTable M 
            INNER JOIN #TempItems T ON T.ItemID = M.ItemID AND M.D1_Code = ''' + @DCode + '''')
  EXECUTE('UPDATE #TempItems SET [' + @DCode + '] = M.D2
                FROM #MasterTable M 
            INNER JOIN #TempItems T ON T.ItemID = M.ItemID AND M.D2_Code = ''' + @DCode + '''')
  EXECUTE('UPDATE #TempItems SET [' + @DCode + '] = M.D3
                FROM #MasterTable M 
            INNER JOIN #TempItems T ON T.ItemID = M.ItemID AND M.D3_Code = ''' + @DCode + '''')


    FETCH NEXT FROM ColAdd INTO @DCode
    END
    CLOSE ColAdd
    DEALLOCATE ColAdd
    IF (@Cnt = 1)
    BEGIN

    SELECT  @DCode = STUFF(( SELECT  DISTINCT '],[' + ltrim(DCodes) 
                        FROM  @Dim 
                        ORDER BY '],[' + ltrim(DCodes)
                        FOR XML PATH('')

                                    ), 1, 2, '') + ']'

   EXECUTE ('SELECT ItemID, ItemName, Specifications, ' + @DCode + ' FROM #TempItems ORDER BY ItemName') 
   END

    DROP TABLE #TempItems
    DROP TABLE #MasterTable

END

Answer 1

It’s possible to do this from within a Scalar Function, not possible to do from a Table Valued Function. Scalar-valued Functions return a single data-type value and cannot return tables either. Since you cannot select from a stored procedure (you need to EXEC) there is no place for this in a table-valued function.

In general, if the stored procedure
returns a, single, result set, define
a table-valued function. If the stored
procedure computes a scalar value,
define a scalar function.

From: Rewriting Stored Procedures as Functions

Re-writing the Stored Procedure as a Table-Valued Function will yield you the most performance.