SQL 语句实现行转列

CREATE TABLE #tempcloum(
    [productNum] varchar()  null,
    [year1] decimal not null,
    [year2] decimal not null,
    [year3] decimal not null
)
--лляD┴л
DECLARE @sql VARCHAR()
SET @sql = 'SELECT [productNum],'
SELECT @sql = @sql + 'SUM(CASE [year] WHEN '''+[year]+''' THEN [price] ELSE 0 END) AS '''+[year]+''','
FROM (SELECT DISTINCT [year] FROM #tempYear) AS a
SELECT @sql = LEFT(@sql,LEN(@sql)-) + ' FROM #tempYear  GROUP BY [productNum] '
PRINT(@sql)

insert into #tempcloum

EXEC(@sql)
GO