【IT168技术文档】

　　现在让我们来介绍两个IPVOT和NIPVOT的例子，给做相关开发的朋友提供一个参考：

DECLARE @t TABLE(student varchar(50),class varchar(50),grade int)
INSERT INTO @t
SELECT '孙小美','数学',10 UNION ALL
SELECT '孙小美','语文',20 UNION ALL
SELECT '孙小美','英语',30 UNION ALL
SELECT '阿土伯','数学',40 UNION ALL
SELECT '阿土伯','语文',50 UNION ALL
SELECT '阿土伯','英语',60 UNION ALL
SELECT '小叮铛','数学',70 UNION ALL
SELECT '小叮铛','语文',80 UNION ALL
SELECT '小叮铛','英语',90
/**//* SQL Server 2000的交叉表*/
SELECT
student,
MAX(数学) AS 数学,
MAX(语文) AS 语文,
MAX(英语) AS 英语
FROM
(
SELECT
student,
CASE class WHEN '数学' THEN grade END AS 数学,
CASE class WHEN '语文' THEN grade END AS 语文,
CASE class WHEN '英语' THEN grade END AS 英语
FROM @t
) AS a
GROUP BY student
/**//* PIVOT */
SELECT student,数学,语文,英语 INTO #t FROM @t
PIVOT
(
MAX(grade) FOR class IN (数学,语文,英语)
) AS p
/**//* UNPION */
SELECT student,class,grade FROM #t
UNPIVOT
(
grade FOR class IN (数学,语文,英语)
) AS u
DROP TABLE #t