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提交日期 题目名称 提交代码
2026-02-04 抖音面试真题（1）T+1日留存率  
with date1 as(
	select
		distinct usr_id,
		date(login_time) as login_date
	from
		user_login_log
	where
		datediff(current_date,date(login_time)) <= 30
),
date2 as(
	select
		t1.usr_id,
		t1.login_date,
		date(t2.login_date) as login_date1
	from date1 t1
	left join
		date1 t2
	on
		t1.login_date = date(t2.login_date) - 1
		and t1.usr_id = t2.usr_id
	order by t1.login_date
)
select
	login_date as first_login_date,
concat(round(avg(login_date1 is not null)*100,2),'%') as retention_rate
from date2
group by login_date
order by login_date
2026-02-03 销售金额前10的商品信息  
select goods_id,sum(order_gmv) as gmv from order_info
where date(order_time) = '2024-9-10'
group by goods_id
order by gmv desc
limit 10
2026-02-03 销售金额前10的商品信息  
select goods_id from(
select goods_id,sum(order_gmv) as gmv from order_info
where year(order_time) = 2024 and month(order_time) = 9 and day(order_time) = 10
group by goods_id) t
order by gmv desc
limit 10
2026-02-03 销售金额前10的商品信息  
select goods_id from(
select goods_id,sum(order_gmv) as gmv from order_info
where year(order_time) = 2024 and month(order_time) = 9 and day(order_time) = 10
group by goods_id) t
order by gmv desc
2026-02-03 销售金额前10的商品信息  
select * from order_info
where year(order_time) = 2024 and month(order_time) = 9 and day(order_time) = 10
order by order_gmv desc
limit 10