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我想从一些数据构造一个邻接矩阵。假设图的顶点是用户名。如何从我的数据中选择一组用户名作为列?行应该只是select user_name from table
select user_name from table
您可以使用GROUP_CONCAT. 这里有很多关于如何应用它的帖子。
GROUP_CONCAT
I have an html page with many tables.
<html> <table> POINTER_TEXT some other stuff <table that i want START> </table that i want END> some other stuff
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