Att få en dynamiskt genererad pivottabell till en Temp-tabell

Sprang in på det här numret idag och la upp på min blogg. Kort beskrivning av lösningen är att skapa en temporär tabell med en kolumn och sedan ÄNDRA den dynamiskt med sp_executesql. Sedan kan du infoga resultaten av den dynamiska PIVOT i den. Arbetsexempel nedan.

CREATE TABLE #Manufacturers
(
    ManufacturerID INT PRIMARY KEY,
    Name VARCHAR(128)
)

INSERT INTO #Manufacturers (ManufacturerID, Name)
VALUES (1,'Dell')
INSERT INTO #Manufacturers (ManufacturerID, Name)
VALUES (2,'Lenovo')
INSERT INTO #Manufacturers (ManufacturerID, Name)
VALUES (3,'HP')

CREATE TABLE #Years
(YearID INT, Description VARCHAR(128))
GO

INSERT INTO #Years (YearID, Description) VALUES (1, '2014')
INSERT INTO #Years (YearID, Description) VALUES (2, '2015')
GO

CREATE TABLE #Sales
(ManufacturerID INT, YearID INT,Revenue MONEY)
GO

INSERT INTO #Sales (ManufacturerID, YearID, Revenue) VALUES(1,2,59000000000)
INSERT INTO #Sales (ManufacturerID, YearID, Revenue) VALUES(2,2,46000000000)
INSERT INTO #Sales (ManufacturerID, YearID, Revenue) VALUES(3,2,111500000000)
INSERT INTO #Sales (ManufacturerID, YearID, Revenue) VALUES(1,1,55000000000)
INSERT INTO #Sales (ManufacturerID, YearID, Revenue) VALUES(2,1,42000000000)
INSERT INTO #Sales (ManufacturerID, YearID, Revenue) VALUES(3,1,101500000000)
GO

DECLARE @SQL AS NVARCHAR(MAX)
DECLARE @PivotColumnName AS NVARCHAR(MAX)
DECLARE @TempTableColumnName AS NVARCHAR(MAX)
DECLARE @AlterTempTable AS NVARCHAR(MAX)

--get delimited column names for various SQL statements below
SELECT 
    -- column names for pivot
    @PivotColumnName= ISNULL(@PivotColumnName + N',',N'') + QUOTENAME(CONVERT(NVARCHAR(10),YearID)),
    -- column names for insert into temp table
    @TempTableColumnName = ISNULL(@TempTableColumnName + N',',N'') + QUOTENAME('Y' + CONVERT(NVARCHAR(10),YearID)),
    -- column names for alteration of temp table
    @AlterTempTable = ISNULL(@AlterTempTable + N',',N'') + QUOTENAME('Y' + CONVERT(NVARCHAR(10),YearID)) + ' MONEY' 
FROM (SELECT DISTINCT [YearID] FROM #Sales) AS Sales

CREATE TABLE #Pivot
(
     ManufacturerID INT
)

-- Thats it! Because the following step will flesh it out.

SET @SQL = 'ALTER TABLE #Pivot ADD ' + @AlterTempTable
EXEC sp_executesql @SQL

--execute the dynamic PIVOT query into the temp table 
SET @SQL =  N'
    INSERT INTO #Pivot (ManufacturerID, ' + @TempTableColumnName + ')
    SELECT ManufacturerID, ' + @PivotColumnName + '
    FROM #Sales S
    PIVOT(SUM(Revenue) 
      FOR S.YearID IN (' + @PivotColumnName + ')) AS PivotTable'
EXEC sp_executesql @SQL

SELECT M.Name, P.*
FROM #Manufacturers M
INNER JOIN #Pivot P ON M.ManufacturerID = P.ManufacturerID