SQL: PIVOT 数据透视 行列转换
-- 数据透视
-- PIVOT： 行转列
SELECT * FROM
(
SELECT N‘张三‘ AS 姓名, N‘语文‘ AS 课程,70 AS 分数 UNION
SELECT N‘张三‘ AS 姓名, N‘数学‘ AS 课程,90 AS 分数 UNION
SELECT N‘李四‘ AS 姓名, N‘语文‘ AS 课程,85 AS 分数 UNION
SELECT N‘李四‘ AS 姓名, N‘数学‘ AS 课程,85 AS 分数
) AS A
PIVOT
(
MAX(分数)
FOR 课程
IN(语文, 数学)
) AS B-- UNPIVOT: 列转行
SELECT 姓名, 课程, 分数 FROM
(
SELECT N‘张三‘ AS 姓名, 70 AS 语文, 90 AS 数学 UNION
SELECT N‘李四‘ AS 姓名, 85 AS 语文, 85 AS 数学
) AS B
UNPIVOT
(
分数
FOR 课程
IN(语文, 数学)
) AS A
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