mysql - 数据透视表sql

Question

我有这张表:

|............id.............|............a............. |.............b............|
|...........123qwe....      |...........0.............  |.............13...........|

我需要像这样旋转它:

|.........id................|........indicator....      |.............value........ |
|...........123qwe....      |...........a.............  |.............0.............|
|...........123qwe....      |...........b.............  |.............13........... |

有超过 100 列以指示器作为标题(a、b、c、d、e、f...)，因此需要某种循环。

Answer 1

 SELECT id, 'a', SUM(a)
 FROM yourtable
 GROUP BY id
 UNION 
 SELECT id, 'b', SUM(b)
 FROM yourtable
 GROUP BY id
 UNION
 ...

像往常一样，正确的答案是标准化您的架构。