在 MySQL 中将行转置为列
如何在 MySQL 查询中将行转换为列?
How can I convert rows into columns in a MySQL query?
推荐答案
你可以用 GROUP_CONCAT 把行变成 a 列，但是你不能转置整个结果集以任何自动方式.您要么编写一个手动生成每一列的查询，要么在应用程序中执行.
You can turn rows into a column with GROUP_CONCAT, but you can't transpose whole result sets in any automatic way. You either write a query that produces each column manually, or you do it in an application.
这是一个关于编写复杂查询以模拟换位的教程:
Here's a tutorial on writing the complicated queries to emulate the transposition:
http://www.artfulsoftware.com/infotree/queries.php#78
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