例如，我有一个名为“stdinfo”的表
Id Name Mark
-----------------
1 Helal 10
2 Shakil 15
... ... ...
... ... ...
... ... ...
现在我想像下面这样转换表格结果
Name Helal Shakil ...
----------------------
Id 1 2 ...
Mark 10 15 ...
有一点很重要，就是行数不固定。
最佳答案
你可以试试这个
表格
--------------------------------------------------
subject_id subjectname classid teacher_id
---------------------------------------------------
3 Math 3 T-1
4 Economics 4 T-1
5 Physcis 3 T-1
--------------------------------------------------
查询:
SELECT sum( if( subjectname = 'Math', subject_id, 0 ) ) AS 'Economics',
sum( if( subjectname = 'Economics', subject_id, 0 ) ) AS 'Math',
sum( if( subjectname = 'Physcis', subject_id, 0 ) ) AS 'Physcis'
FROM tbsubject group by subjectname
输出:
----------------------------
Math Economics Physcis
---------------------------
0 4 0
3 0 0
0 0 5
----------------------------
或者您可以通过编程创建 View 。更多示例请参见数据透视表 http://www.krishnasunuwar.com.np/2011/02/crosstab-query-pivot-table-or-transformation-of-rows-into-columns/
关于mysql - 如何对MySQL表数据和列进行转置操作？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21875964/