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[Niu Ke brush questions-SQL big factory interview questions] NO5. Analysis of a treasure store (e-commerce model)
2022-08-04 13:03:00 【IT Bond】
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SQL180 某宝店铺的SPU数量
建表语句
drop table if exists product_tb;
CREATE TABLE product_tb(
item_id char(10) NOT NULL,
style_id char(10) NOT NULL,
tag_price int(10) NOT NULL,
inventory int(10) NOT NULL
);
INSERT INTO product_tb VALUES('A001', 'A', 100, 20);
INSERT INTO product_tb VALUES('A002', 'A', 120, 30);
INSERT INTO product_tb VALUES('A003', 'A', 200, 15);
INSERT INTO product_tb VALUES('B001', 'B', 130, 18);
INSERT INTO product_tb VALUES('B002', 'B', 150, 22);
INSERT INTO product_tb VALUES('B003', 'B', 125, 10);
INSERT INTO product_tb VALUES('B004', 'B', 155, 12);
INSERT INTO product_tb VALUES('C001', 'C', 260, 25);
INSERT INTO product_tb VALUES('C002', 'C', 280, 18);
需求
请你统计每款的SPU（货号）数量,并按SPU数量降序排序
答案
select style_id,count(item_id) as SPU_num
from product_tb
group by style_id
order by SPU_num desc
SQL181 某宝店铺的实际销售额与客单价
建表语句
drop table if exists sales_tb;
CREATE TABLE sales_tb(
sales_date date NOT NULL,
user_id int(10) NOT NULL,
item_id char(10) NOT NULL,
sales_num int(10) NOT NULL,
sales_price int(10) NOT NULL
);
INSERT INTO sales_tb VALUES('2021-11-1', 1, 'A001', 1, 90);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'A002', 2, 220);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-2', 3, 'C001', 2, 500);
INSERT INTO sales_tb VALUES('2021-11-2', 4, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-3', 5, 'C001', 1, 240);
INSERT INTO sales_tb VALUES('2021-11-3', 6, 'C002', 1, 270);
INSERT INTO sales_tb VALUES('2021-11-4', 7, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-4', 8, 'B002', 1, 140);
INSERT INTO sales_tb VALUES('2021-11-4', 9, 'B001', 1, 125);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B004', 1, 150);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-6', 11, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-6', 10, 'B004', 1, 150);
需求
请你统计实际总销售额与客单价（人均付费,总收入/总用户数,结果保留两位小数）
答案
select sum(sales_price) as sales_total,
round(sum(sales_price)/count(distinct user_id),2) as per_trans
from sales_tb
SQL182 某宝店铺折扣率
建表语句
drop table if exists product_tb;
CREATE TABLE product_tb(
item_id char(10) NOT NULL,
style_id char(10) NOT NULL,
tag_price int(10) NOT NULL,
inventory int(10) NOT NULL
);
INSERT INTO product_tb VALUES('A001', 'A', 100, 20);
INSERT INTO product_tb VALUES('A002', 'A', 120, 30);
INSERT INTO product_tb VALUES('A003', 'A', 200, 15);
INSERT INTO product_tb VALUES('B001', 'B', 130, 18);
INSERT INTO product_tb VALUES('B002', 'B', 150, 22);
INSERT INTO product_tb VALUES('B003', 'B', 125, 10);
INSERT INTO product_tb VALUES('B004', 'B', 155, 12);
INSERT INTO product_tb VALUES('C001', 'C', 260, 25);
INSERT INTO product_tb VALUES('C002', 'C', 280, 18);
drop table if exists sales_tb;
CREATE TABLE sales_tb(
sales_date date NOT NULL,
user_id int(10) NOT NULL,
item_id char(10) NOT NULL,
sales_num int(10) NOT NULL,
sales_price int(10) NOT NULL
);
INSERT INTO sales_tb VALUES('2021-11-1', 1, 'A001', 1, 90);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'A002', 2, 220);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-2', 3, 'C001', 2, 500);
INSERT INTO sales_tb VALUES('2021-11-2', 4, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-3', 5, 'C001', 1, 240);
INSERT INTO sales_tb VALUES('2021-11-3', 6, 'C002', 1, 270);
INSERT INTO sales_tb VALUES('2021-11-4', 7, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-4', 8, 'B002', 1, 140);
INSERT INTO sales_tb VALUES('2021-11-4', 9, 'B001', 1, 125);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B004', 1, 150);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-6', 11, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-6', 10, 'B004', 1, 150);
需求
请你统计折扣率（GMV/吊牌金额,GMV指的是成交金额）,折扣率保留两位小数：
' 答案
select
round(sum(sales_price)*100/sum(sales_num*tag_price),2) discount_rate
from sales_tb left join product_tb using(item_id)
SQL183 某宝店铺动销率与售罄率
建表语句
drop table if exists product_tb;
CREATE TABLE product_tb(
item_id char(10) NOT NULL,
style_id char(10) NOT NULL,
tag_price int(10) NOT NULL,
inventory int(10) NOT NULL
);
INSERT INTO product_tb VALUES('A001', 'A', 100, 20);
INSERT INTO product_tb VALUES('A002', 'A', 120, 30);
INSERT INTO product_tb VALUES('A003', 'A', 200, 15);
INSERT INTO product_tb VALUES('B001', 'B', 130, 18);
INSERT INTO product_tb VALUES('B002', 'B', 150, 22);
INSERT INTO product_tb VALUES('B003', 'B', 125, 10);
INSERT INTO product_tb VALUES('B004', 'B', 155, 12);
INSERT INTO product_tb VALUES('C001', 'C', 260, 25);
INSERT INTO product_tb VALUES('C002', 'C', 280, 18);
drop table if exists sales_tb;
CREATE TABLE sales_tb(
sales_date date NOT NULL,
user_id int(10) NOT NULL,
item_id char(10) NOT NULL,
sales_num int(10) NOT NULL,
sales_price int(10) NOT NULL
);
INSERT INTO sales_tb VALUES('2021-11-1', 1, 'A001', 1, 90);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'A002', 2, 220);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-2', 3, 'C001', 2, 500);
INSERT INTO sales_tb VALUES('2021-11-2', 4, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-3', 5, 'C001', 1, 240);
INSERT INTO sales_tb VALUES('2021-11-3', 6, 'C002', 1, 270);
INSERT INTO sales_tb VALUES('2021-11-4', 7, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-4', 8, 'B002', 1, 140);
INSERT INTO sales_tb VALUES('2021-11-4', 9, 'B001', 1, 125);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B004', 1, 150);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-6', 11, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-6', 10, 'B004', 1, 150);
需求
请你统计每款的动销率（pin_rate,有销售的SKU数量/在售SKU数量）与售罄率（sell-through_rate,GMV/备货值,备货值=吊牌价*库存数）,按style_id升序排序
答案
select
style_id
,round(sum(t2.sales_num)/(sum(inventory)-sum(t2.sales_num))*100,2) pin_rate
,round(sum(sales_price)/sum(tag_price*inventory)*100,2) sell_rate
from product_tb t1 join
(select
item_id
,sum(sales_num) sales_num
,sum(sales_price) sales_price
from sales_tb
group by item_id) t2
using(item_id)
group by style_id
order by style_id
SQL184 某宝店铺连续2天及以上购物的用户及其对应的天数
建表语句
drop table if exists sales_tb;
CREATE TABLE sales_tb(
sales_date date NOT NULL,
user_id int(10) NOT NULL,
item_id char(10) NOT NULL,
sales_num int(10) NOT NULL,
sales_price int(10) NOT NULL
);
INSERT INTO sales_tb VALUES('2021-11-1', 1, 'A001', 1, 90);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'A002', 2, 220);
INSERT INTO sales_tb VALUES('2021-11-1', 2, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-2', 3, 'C001', 2, 500);
INSERT INTO sales_tb VALUES('2021-11-2', 4, 'B001', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-3', 5, 'C001', 1, 240);
INSERT INTO sales_tb VALUES('2021-11-3', 6, 'C002', 1, 270);
INSERT INTO sales_tb VALUES('2021-11-4', 7, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-4', 8, 'B002', 1, 140);
INSERT INTO sales_tb VALUES('2021-11-4', 9, 'B001', 1, 125);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'B004', 1, 150);
INSERT INTO sales_tb VALUES('2021-11-5', 10, 'A003', 1, 180);
INSERT INTO sales_tb VALUES('2021-11-6', 11, 'B003', 1, 120);
INSERT INTO sales_tb VALUES('2021-11-6', 10, 'B004', 1, 150);
需求
请你统计连续2天及以上在该店铺购物的用户及其对应的次数（若有多个用户,按user_id升序排序）
答案
select user_id,
count(diff) date_cnt
from
(select user_id,
sales_date - rk diff
from
(select user_id,
sales_date,
rank() over(partition by sales_date) rk
from (select distinct user_id,sales_date from sales_tb)aa )a) b
group by user_id
having date_cnt>=2
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