Hive 刷题——银行可以支付监测-526互联

场景说明

有一个支付流水表，关键字段：用户，交易时间，交易金额，现在规定：两个小时内交易此时大于2且交易总结金大于100000的用户为可疑用户，现在需要使用HiveSQL 进行监测

数据准备

CREATE TABLE transfer_log
(
    log_id    INTEGER,
    log_ts    TIMESTAMP,
    from_user VARCHAR(50),
    to_user   VARCHAR(50),
    type      VARCHAR(10),
    amount    NUMERIC(10)
) stored as orc tblproperties ('orc.compress' = 'snappy');
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (1, '2023-06-02 10:31:40', '62221234567890', NULL, '存款', 50000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (2, '2023-06-02 10:32:15', '62221234567890', NULL, '存款', 100000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (3, '2023-06-03 08:14:29', '62221234567890', '62226666666666', '转账', 200000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (4, '2023-06-05 13:55:38', '62221234567890', '62226666666666', '转账', 150000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (5, '2023-06-07 20:00:31', '62221234567890', '62227777777777', '转账', 300000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (6, '2023-06-09 17:28:07', '62221234567890', '62227777777777', '转账', 500000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (7, '2023-06-10 07:46:02', '62221234567890', '62227777777777', '转账', 100000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (8, '2023-06-11 09:36:53', '62221234567890', NULL, '存款', 40000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (9, '2023-06-12 07:10:01', '62221234567890', '62228888888881', '转账', 10000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (10, '2023-06-12 07:11:12', '62221234567890', '62228888888882', '转账', 8000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (11, '2023-06-12 07:12:36', '62221234567890', '62228888888883', '转账', 5000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (12, '2023-06-12 07:13:55', '62221234567890', '62228888888884', '转账', 6000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (13, '2023-06-12 07:14:24', '62221234567890', '62228888888885', '转账', 7000);
INSERT INTO transfer_log (log_id, log_ts, from_user, to_user, type, amount)
VALUES (14, '2023-06-21 12:11:16', '62221234567890', '62228888888885', '转账', 70000)

解题思路

本题主要考察的是窗口函数，以及窗口函数内部窗口大小控制的事情

参考实现

第一步：先开窗计算每个用户两个小时内的交易次数和交易总金额

select from_user
     , sum(1)
           over (partition by from_user order by unix_timestamp(log_ts) range between 7200 preceding and current row) cnt
     , sum(amount)
           over (partition by from_user order by unix_timestamp(log_ts) range between 7200 preceding and current row) amount
from transfer_log;

这样以来直接对这个结果进行过来就行了

select from_user
from (select from_user
           , sum(1)
                 over (partition by from_user order by unix_timestamp(log_ts) range between 7200 preceding and current row) cnt
           , sum(amount)
                 over (partition by from_user order by unix_timestamp(log_ts) range between 7200 preceding and current row) amount
      from transfer_log) y
where amount >= 50000
  and cnt > 4
group by from_user;