LeetCode 262. Trips and Users

select allo.r, round(ifnull(canceled.c/allo.c,0),2) from (select count(1) as c,Request_at as r from Trips t,Users u where t.Client_Id = u.Users_Id and u.Banned = 'No' and t.Request_at between '2013-10-01' and '2013-10-03' and t.Status != 'completed' group by Request_at) canceled right join (select count(1) as c,Request_at as r from Trips t,Users u where t.Client_Id = u.Users_Id and u.Banned = 'No' and t.Request_at between '2013-10-01' and '2013-10-03' group by Request_at) allo on canceled.r = allo.r 

需要注意的是：

• Leetcode的sql是认大小写的
• as 后面的重命名字符串如果有空格需要用单引号圈起来，如’ Cancellation Rate ‘
• 表名列名不能重命名成all
• 答案中需要保留两位

附上数据库脚本：

+----+-----------+-----------+---------+--------------------+----------+
| Id | Client_Id | Driver_Id | City_Id | Status |Request_at| +----+-----------+-----------+---------+--------------------+----------+
| 1  |     1     |    10     |    1    |     completed      |2013-10-01|
| 2  |     2     |    11     |    1    | cancelled_by_driver|2013-10-01|
| 3  |     3     |    12     |    6    |     completed      |2013-10-01|
| 4  |     4     |    13     |    6    | cancelled_by_client|2013-10-01|
| 5  |     1     |    10     |    1    |     completed      |2013-10-02|
| 6  |     2     |    11     |    6    |     completed      |2013-10-02|
| 7  |     3     |    12     |    6    |     completed      |2013-10-02|
| 8  |     2     |    12     |    12   |     completed      |2013-10-03|
| 9  |     3     |    10     |    12   |     completed      |2013-10-03| 
| 10 | 4 | 13 | 12 | cancelled_by_driver|2013-10-03| +----+-----------+-----------+---------+--------------------+----------+

create table Trip (
 Id Integer Primary Key,
 Client_Id Integer,
 Driver_Id Integer,
 City_Id Integer,
 Status varchar(255),
 Request_at DATE
);

+----------+--------+--------+
| Users_Id | Banned | Role | +----------+--------+--------+
|    1     |   No   | client |
|    2     |   Yes  | client |
|    3     |   No   | client |
|    4     |   No   | client |
|    10    |   No   | driver |
|    11    |   No   | driver |
|    12    |   No   | driver |
| 13 | No | driver | +----------+--------+--------+


create table Users (
 Users_Id Integer Primary Key,
 Banned varchar(255),
 Role varchar(255)
);