怎么样将SQL Server纵表与横表相互转换?

怎么样将SQL Server纵表与横表相互转换?

1,纵表转横表

纵表结构 Table_A:

怎么样将SQL Server纵表与横表相互转换?

转换后的结构:

怎么样将SQL Server纵表与横表相互转换?

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:

怎么样将SQL Server纵表与横表相互转换?

转换后的表结构:

怎么样将SQL Server纵表与横表相互转换?

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路饭网站的支持!