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 

 以上所述是小编给大家介绍的SQL Server纵表与横表相互转换的实现方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对NICE源码网站的支持！