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

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