按查询分组的麻烦

Question

待办事项：我将一组数据按c_id分组，并以每个组的身高最大值取数据。 问题：没有正确显示最大值的数据，如图片2中的c_id = 3。

谢谢，我想问一下如何解决。

Answer 1

您可以检出此查询：

SELECT `id`, `name`, `gender`, `age`, `c_id`, MAX(`height`) AS height 
FROM `student` 
GROUP BY `c_id` 
ORDER BY `height` DESC;

这里是Demo

Answer 2

select * 
  from student
 where (c_id, age,height) in ( Select c_id
                                    , max(age) age
                                    , max(height) as height 
                                 from student 
                                group 
                                   by c_id )

Answer 3

尝试一下

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