我有一张这样的桌子:
id | job | school |
1 | programmer | school1 |
2 | programmer | school1 |
3 | programmer | school2 |
4 | pm | school3 |
5 | pm | school2 |
6 | pm | school3 |
我想做以下事情:
- 按工作分组
- 获取学校列表和计数,像这样[(school1, 2), (school2, 1)]
- 学校列表按计数排序,所以不能是 [(school1, 1), (school1, 2)]
该示例的结果是:
programmer | [(school1, 2), (school2, 1)]
pm | [(school3, 2), (school2, 1)]