描述
现有用户信息表user_info(uid用户ID,nick_name昵称, achievement成就值, level等级, job职业方向, register_time注册时间):
|----|------|-----------|-------------|-------|-----|---------------------|
| id | uid | nick_name | achievement | level | job | register_time |
| 1 | 1001 | 牛客1号 | 1000 | 2 | 算法 | 2020-01-01 10:00:00 |
| 2 | 1002 | 牛客2号 | 1200 | 3 | 算法 | 2020-01-01 10:00:00 |
| 3 | 1003 | 进击的3号 | 2200 | 5 | 算法 | 2020-01-01 10:00:00 |
| 4 | 1004 | 牛客4号 | 2500 | 6 | 算法 | 2020-01-01 10:00:00 |
| 5 | 1005 | 牛客5号 | 3000 | 7 | C++ | 2020-01-01 10:00:00 |
试卷作答记录表exam_record(uid用户ID, exam_id试卷ID, start_time开始作答时间, submit_time交卷时间, score得分):
|----|------|---------|---------------------|---------------------|--------|
| id | uid | exam_id | start_time | submit_time | score |
| 1 | 1001 | 9001 | 2020-01-02 09:01:01 | 2020-01-02 09:21:59 | 80 |
| 3 | 1001 | 9002 | 2021-02-02 19:01:01 | 2021-02-02 19:30:01 | 87 |
| 2 | 1001 | 9001 | 2021-05-02 10:01:01 | (NULL) | (NULL) |
| 4 | 1001 | 9001 | 2021-06-02 19:01:01 | 2021-06-02 19:32:00 | 20 |
| 6 | 1001 | 9002 | 2021-09-01 12:01:01 | (NULL) | (NULL) |
| 5 | 1001 | 9002 | 2021-09-05 19:01:01 | 2021-09-05 19:40:01 | 89 |
| 11 | 1002 | 9001 | 2020-01-01 12:01:01 | 2020-01-01 12:31:01 | 81 |
| 12 | 1002 | 9002 | 2020-02-01 12:01:01 | 2020-02-01 12:31:01 | 82 |
| 13 | 1002 | 9002 | 2020-02-02 12:11:01 | 2020-02-02 12:31:01 | 83 |
| 7 | 1002 | 9002 | 2021-05-05 18:01:01 | 2021-05-05 18:59:02 | 90 |
| 16 | 1002 | 9001 | 2021-09-06 12:01:01 | 2021-09-06 12:21:01 | 80 |
| 17 | 1002 | 9001 | 2021-09-06 12:01:01 | (NULL) | (NULL) |
| 18 | 1002 | 9001 | 2021-09-07 12:01:01 | (NULL) | (NULL) |
| 8 | 1003 | 9003 | 2021-02-06 12:01:01 | (NULL) | (NULL) |
| 9 | 1003 | 9001 | 2021-09-07 10:01:01 | 2021-09-07 10:31:01 | 89 |
| 10 | 1004 | 9002 | 2021-08-06 12:01:01 | (NULL) | (NULL) |
| 14 | 1005 | 9001 | 2021-02-01 11:01:01 | 2021-02-01 11:31:01 | 84 |
| 15 | 1006 | 9001 | 2021-02-01 11:01:01 | 2021-02-01 11:31:01 | 84 |
题目练习记录表practice_record(uid用户ID, question_id题目ID, submit_time提交时间, score得分):
|----|------|-------------|---------------------|-------|
| id | uid | question_id | submit_time | score |
| 1 | 1001 | 8001 | 2021-08-02 11:41:01 | 60 |
| 2 | 1002 | 8001 | 2021-09-02 19:30:01 | 50 |
| 3 | 1002 | 8001 | 2021-09-02 19:20:01 | 70 |
| 4 | 1002 | 8002 | 2021-09-02 19:38:01 | 70 |
| 5 | 1003 | 8002 | 2021-09-01 19:38:01 | 80 |
请找到昵称以『牛客』开头『号』结尾、成就值在1200~2500之间,且最近一次活跃(答题或作答试卷)在2021年9月的用户信息。
由示例数据结果输出如下:
|------|-----------|-------------|
| uid | nick_name | achievement |
| 1002 | 牛客2号 | 1200 |
解释:昵称以『牛客』开头『号』结尾且成就值在1200~2500之间的有1002、1004;
1002最近一次试卷区活跃为2021年9月,最近一次题目区活跃为2021年9月;1004最近一次试卷区活跃为2021年8月,题目区未活跃。
因此最终满足条件的只有1002。
sql
with cte1 as(
select uid,start_time as active_time from exam_record
union all
select uid,submit_time from practice_record
),
cte2 as(
select uid
from
(select uid,active_time,
dense_rank() over(partition by uid order by active_time desc) as time_rank
from cte1)t
where time_rank=1 and left(active_time,7)='2021-09'
)
select
uid,nick_name,achievement
from
cte2 left join user_info
using (uid)
where nick_name like '牛客%号'
and achievement>=1200 and achievement<=2500