SQL Server纵表与横表相互转换的方法

1，纵表转横表

纵表结构 Table_A：

转换后的结构：

纵表转横表的SQL示例：

SELECT Name ,
SUM(CASE WHEN Course = N'语文' THEN Grade
ELSE 0
END) AS Chinese ,
SUM(CASE WHEN Course = N'数学' THEN Grade
ELSE 0
END) AS Mathematics ,
SUM(CASE WHEN Course = N'英语' THEN Grade
ELSE 0
END) AS English
FROM dbo.Table_A
GROUP BY Name

2，横表转纵表

横表结构Table_B：

转换后的表结构：

横表转纵表的SQL示例：

SELECT Name ,
'Chinese' AS Course ,
Chinese AS Score
FROM dbo.Table_B
UNION ALL
SELECT Name ,
'Mathematics' AS Course ,
Mathematics AS Score
FROM dbo.Table_B
UNION ALL
SELECT Name ,
'English' AS Course ,
English AS Score
FROM dbo.Table_B
ORDER BY Name ,
Course DESC

频道导航

SQL Server纵表与横表相互转换的方法

您可能感兴趣的文章: