SQL Server縱表與橫表相互轉換的方法

1，縱表轉橫表

縱表結構 Table_A：

轉換後的結構：

縱表轉橫表的SQL示例：

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

2，橫表轉縱表

橫表結構Table_B：

轉換後的表結構：

橫表轉縱表的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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