SQL169 统计2021年10月每个退货率不大于0.5的商品各项指标
题目描述
现有用户对展示的商品行为表tb_user_event
id | uid | product_id | event_time | if_click | if_cart | if_payment | if_refund |
---|---|---|---|---|---|---|---|
1 | 101 | 8001 | 2021-10-01 10:00:00 | 0 | 0 | 0 | 0 |
2 | 102 | 8001 | 2021-10-01 10:00:00 | 1 | 0 | 0 | 0 |
3 | 103 | 8001 | 2021-10-01 10:00:00 | 1 | 1 | 0 | 0 |
4 | 104 | 8001 | 2021-10-02 10:00:00 | 1 | 1 | 1 | 0 |
5 | 105 | 8001 | 2021-10-02 10:00:00 | 1 | 1 | 1 | 0 |
6 | 101 | 8002 | 2021-10-03 10:00:00 | 1 | 1 | 1 | 0 |
7 | 109 | 8001 | 2021-10-04 10:00:00 | 1 | 1 | 1 | 1 |
(uid-用户ID, product_id-商品ID, event_time-行为时间, if_click-是否点击, if_cart-是否加购物车, if_payment-是否付款, if_refund-是否退货退款)
问题:请统计2021年10月每个有展示记录的退货率不大于0.5的商品各项指标,
注:
- 商品点击率=点击数÷展示数;
- 加购率=加购数÷点击数;
- 成单率=付款数÷加购数;退货率=退款数÷付款数,
- 当分母为0时整体结果记为0,结果中各项指标保留3位小数,并按商品ID升序排序。
输出示例:
示例数据的输出结果如下:
product_id | ctr | cart_rate | payment_rate | refund_rate |
---|---|---|---|---|
8001 | 0.833 | 0.800 | 0.750 | 0.333 |
8002 | 1.000 | 1.000 | 1.000 | 0.000 |
解释:
在2021年10月商品8001被展示了6次,点击了5次,加购了4次,付款了3次,退款了1次,因此点击率为5/6=0.833,加购率为4/5=0.800,
成单率为3/4=0.750,退货率为1/3=0.333(保留3位小数);
SQL Schema
sql
DROP TABLE IF EXISTS tb_user_event;
CREATE TABLE tb_user_event
(
id INT PRIMARY KEY AUTO_INCREMENT COMMENT '自增ID',
uid INT NOT NULL COMMENT '用户ID',
product_id INT NOT NULL COMMENT '商品ID',
event_time datetime COMMENT '行为时间',
if_click TINYINT COMMENT '是否点击',
if_cart TINYINT COMMENT '是否加购物车',
if_payment TINYINT COMMENT '是否付款',
if_refund TINYINT COMMENT '是否退货退款'
) CHARACTER SET utf8
COLLATE utf8_bin;
INSERT INTO tb_user_event(uid, product_id, event_time, if_click, if_cart, if_payment, if_refund)
VALUES (101, 8001, '2021-10-01 10:00:00', 0, 0, 0, 0),
(102, 8001, '2021-10-01 10:00:00', 1, 0, 0, 0),
(103, 8001, '2021-10-01 10:00:00', 1, 1, 0, 0),
(104, 8001, '2021-10-02 10:00:00', 1, 1, 1, 0),
(105, 8001, '2021-10-02 10:00:00', 1, 1, 1, 0),
(101, 8002, '2021-10-03 10:00:00', 1, 1, 1, 0),
(109, 8001, '2021-10-04 10:00:00', 1, 1, 1, 1);
答案
sql
SELECT product_id,
ROUND(SUM(if_click) / COUNT(*), 3) AS `ctr`,
ROUND(IFNULL(SUM(if_cart) / SUM(if_click), 0), 3) AS `cart_rate`,
ROUND(IFNULL(SUM(if_payment) / SUM(if_cart), 0), 3) AS `payment_rate`,
ROUND(IFNULL(SUM(if_refund) / SUM(if_payment), 0), 3) AS `refund_rate`
FROM tb_user_event
WHERE YEAR(event_time) = 2021
AND MONTH(event_time) = 10
GROUP BY product_id
HAVING refund_rate <= 0.5
ORDER BY product_id;