mysql - sql中使用group by和count后如何使用count？

Question

我正在尝试查看有多少乘客通过我的应用程序的统计数据。选择此查询后；

select count(person_id), person_id from Passenger group by person_id;

count(person_id)    person_id
6                  123
2                  421
1                  542
3                  612
1                  643
2                  876

我看到乘客“123”经过了6次。 “421”通过了2次。 “542”通过了1次等等。所以我想分析一下；

>     1 passenger passed 6 times,
>     2 passenger passed 2 times,
>     2 passenger passed 1 times,
>     1 passenger passed 3 times..

这里是sqlFiddle为了您更好的理解..

Answer 1

您可以使用带有子查询的SELECT来获取您想要的结果:

SELECT Concat(COUNT(*), ' passenger passed ', table.theCount, ' times,') FROM
(
    SELECT COUNT(person_id) AS theCount, person_id
    FROM Passenger
    GROUP BY person_id
) table
GROUP BY table.theCount