现有试卷作答记录表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），示例数据如下： id uid exam_id start_time submit_time score 1 1001 9001 2021-07-02 09:01:01 2021-07-02 09:21:01 80 2 1002 9001 2021-09-05 19:01:01 2021-09-05 19:40:01 81 3 1002 9002 2021-09-02 12:01:01 (NULL) (NULL) 4 1002 9003 2021-09-01 12:01:01 (NULL) (NULL) 5 1002 9001 2021-07-02 19:01:01 2021-07-02 19:30:01 82 6 1002 9002 2021-07-05 18:01:01 2021-07-05 18:59:02 90 7 1003 9002 2021-07-06 12:01:01 (NULL) (NULL) 8 1003 9003 2021-09-07 10:01:01 2021-09-07 10:31:01 86 9 1004 9003 2021-09-06 12:01:01 (NULL) (NULL) 10 1002 9003 2021-09-01 12:01:01 2021-09-01 12:31:01 81 11 1005 9001 2021-09-01 12:01:01 2021-09-01 12:31:01 88 12 1005 9002 2021-09-01 12:01:01 2021-09-01 12:31:01 88 13 1006 9002 2021-09-02 12:11:01 2021-09-02 12:31:01 89 还有一张试卷信息表examination_info（exam_id试卷ID, tag试卷类别, difficulty试卷难度, duration考试时长, release_time发布时间），示例数据如下： id exam_id tag difficulty duration release_time 1 9001 SQL hard 60 2020-01-01 10:00:00 2 9002 SQL easy 60 2020-02-01 10:00:00 3 9003 算法 medium 80 2020-08-02 10:00:00 请统计2021年每个未完成试卷作答数大于1的有效用户的数据（有效用户指完成试卷作答数至少为1且未完成数小于5），输出用户ID、未完成试卷作答数、完成试卷作答数、作答过的试卷tag集合，按未完成试卷数量由多到少排序。示例数据的输出结果如下： uid incomplete_cnt complete_cnt detail 1002 2 4 2021-09-01:算法;2021-07-02:SQL;2021-09-02:SQL;2021-09-05:SQL;2021-07-05:SQL 解释：2021年的作答记录中，除了1004，其他用户均满足有效用户定义，但只有1002未完成试卷数大于1，因此只输出1002，detail中是1002作答过的试卷{日期:tag}集合，日期和tag间用:连接，多元素间用;连接。
示例1

输入

drop table if exists examination_info;
CREATE TABLE examination_info (
    id int PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID',
    exam_id int UNIQUE NOT NULL COMMENT '试卷ID',
    tag varchar(32) COMMENT '类别标签',
    difficulty varchar(8) COMMENT '难度',
    duration int NOT NULL COMMENT '时长',
    release_time datetime COMMENT '发布时间'
)CHARACTER SET utf8 COLLATE utf8_general_ci;

drop table if exists exam_record;
CREATE TABLE  exam_record (
    id int PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID',
    uid int NOT NULL COMMENT '用户ID',
    exam_id int NOT NULL COMMENT '试卷ID',
    start_time datetime NOT NULL COMMENT '开始时间',
    submit_time datetime COMMENT '提交时间',
    score tinyint COMMENT '得分'
)CHARACTER SET utf8 COLLATE utf8_general_ci;

INSERT INTO examination_info(exam_id,tag,difficulty,duration,release_time) VALUES
  (9001, 'SQL', 'hard', 60, '2020-01-01 10:00:00'),
  (9002, 'SQL', 'easy', 60, '2020-02-01 10:00:00'),
  (9003, '算法', 'medium', 80, '2020-08-02 10:00:00');

INSERT INTO exam_record(uid,exam_id,start_time,submit_time,score) VALUES
(1001, 9001, '2021-07-02 09:01:01', '2021-07-02 09:21:01', 80),
(1002, 9001, '2021-09-05 19:01:01', '2021-09-05 19:40:01', 81),
(1002, 9002, '2021-09-02 12:01:01', null, null),
(1002, 9003, '2021-09-01 12:01:01', null, null),
(1002, 9001, '2021-07-02 19:01:01', '2021-07-02 19:30:01', 82),
(1002, 9002, '2021-07-05 18:01:01', '2021-07-05 18:59:02', 90),
(1003, 9002, '2021-07-06 12:01:01', null, null),
(1003, 9003, '2021-09-07 10:01:01', '2021-09-07 10:31:01', 86),
(1004, 9003, '2021-09-06 12:01:01', null, null),
(1002, 9003, '2021-09-01 12:01:01', '2021-09-01 12:31:01', 81),
(1005, 9001, '2021-09-01 12:01:01', '2021-09-01 12:31:01', 88),
(1005, 9002, '2021-09-01 12:01:01', '2021-09-01 12:31:01', 88),
(1006, 9002, '2021-09-02 12:11:01', '2021-09-02 12:31:01', 89);

输出

1002|2|4|2021-07-02:SQL;2021-07-05:SQL;2021-09-01:算法;2021-09-02:SQL;2021-09-05:SQL

备注:
按未完成试卷数量由多到少排序
加载中...