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提交日期 题目名称 提交代码
2026-01-02 滴滴面试真题(2)打车订单呼叫应答时间 
SELECT 
    sum(TIMESTAMPDIFF(SECOND, call_time, grab_time))/count(1) AS avg_response_time_seconds
FROM 
    didi_order_rcd
WHERE 
    grab_time != '1970-01-01 00:00:00';
2026-01-02 绘制小时进入人数曲线 
SELECT 
LPAD(HOUR(enter_time), 2, '0') AS hour_entered,
COUNT(1) AS enter_count
FROM ks_live_t1 t1 
JOIN ks_live_t2 t2 ON t1.live_id = t2.live_id
WHERE enter_time IS NOT NULL
GROUP BY LPAD(HOUR(enter_time), 2, '0')
ORDER BY hour_entered ASC;
2026-01-02 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
SELECT usr_id,	mch_nm	,trx_time,	trx_amt
FROM (
SELECT 
*,
RANK() OVER (ORDER BY trx_amt DESC) AS amt_rank
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520' 
AND YEAR(trx_time) = 2024
) t
WHERE t.amt_rank = 1;
2026-01-02 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
SELECT *
FROM (
SELECT 
*,
RANK() OVER (ORDER BY trx_amt DESC) AS amt_rank
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520' 
AND YEAR(trx_time) = 2024
) t
WHERE t.amt_rank = 1;
2026-01-02 子查询(1)玩的最嗨那天在做甚?要用Where子查询 
SELECT *
FROM cmb_usr_trx_rcd
WHERE usr_id = '5201314520' 
AND YEAR(trx_time) = 2024
ORDER BY trx_amt DESC
LIMIT 1;
2026-01-02 分组与聚合函数(6)想知道渣男有多坏,疯狂使用GroupBy 
select usr_id,mch_nm,sum(trx_amt) as trx_amt,count(*)as trx_cnt,min(trx_time)as first_time
from cmb_usr_trx_rcd
where usr_id='5201314520'
and trx_amt>=288 
group by usr_id,mch_nm
order by trx_cnt desc
2026-01-02 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select usr_id,min(trx_time) as first_time,mch_nm
from cmb_usr_trx_rcd
where usr_id='5201314520'
and mch_nm='红玫瑰按摩保健休闲'
group by mch_nm
2026-01-02 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select usr_id,min(trx_time) as first_time,mch_nm
from cmb_usr_trx_rcd
where usr_id='5201314520'
and mch_nm='红玫瑰按摩保健休息'
group by usr_id,mch_nm
2026-01-02 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select usr_id,min(date(trx_time)) as first_time,mch_nm
from cmb_usr_trx_rcd
where usr_id='5201314520'
and mch_nm='红玫瑰按摩保健休息'
group by usr_id,mch_nm
2026-01-02 分组与聚合函数(5)想知道何时成瘾,用Max Or Min? 
select usr_id,min(date(trx_time)) as first_time,mch_nm
from cmb_usr_trx_rcd
where usr_id='5201314520'
and mch_nm='红玫瑰按摩保健休息'
group by usr_id
2026-01-02 分组与聚合函数(5)五花八门的项目,其实都有固定套路(2) 
select trx_amt,count(*)as total_trx_cnt,
count(distinct(usr_id)) as unique_usr_cnt,
count(*)/count(distinct(usr_id)) as avg_trx_per_user
from cmb_usr_trx_rcd
where
    mch_nm = '红玫瑰按摩保健休闲' 
    and
(year(trx_time) = 2023 
    or (year(trx_time) = 2024 and month(trx_time) between 1 and 6) 
)
group by
    trx_amt 
order by
    avg_trx_per_user desc 
limit 5;
2026-01-02 分组与聚合函数(5)五花八门的项目,其实都有固定套路(2) 
select trx_amt,count(*)as total_trx_cnt,
count(distinct(usr_id)) as unique_usr_cnt,
count(*)/count(distinct(usr_id)) as avg_trx_per_user
from cmb_usr_trx_rcd
where
    mch_nm = '红玫瑰按摩保健休闲' 
    and
(
(year(trx_time) = 2023 and month(trx_time) between 1 and 12) 
    or (year(trx_time) = 2024 and month(trx_time) between 1 and 6) 
)
group by
    trx_amt 
order by
    avg_trx_per_user desc 
limit 5;
2026-01-02 分组与聚合函数(3)五花八门的项目,其实都有固定套路(1) 
select trx_amt,count(*) as trx_cnt
from cmb_usr_trx_rcd
where mch_nm = '红玫瑰按摩保健休闲' 
    and year(trx_time) = 2024 
    and month(trx_time) in (1, 2, 3, 4, 5, 6, 7) 
group by trx_amt
order by trx_cnt desc
limit 5
2026-01-02 分组与聚合函数(3)五花八门的项目,其实都有固定套路(1) 
select trx_amt,count(*) as trx_cnt
from cmb_usr_trx_rcd
where mch_nm = '红玫瑰按摩保健休闲' 
    and year(trx_time) = 2024 
    and month(trx_time) in (1, 2, 3, 4, 5, 6, 7) 
group by trx_amt
order by trx_cnt desc
2026-01-02 分组与聚合函数(2)擦边营收怎么样,聚合函数可看出 
select date(trx_time) as trx_date,
max(trx_amt)as max_trx_amt,
min(trx_amt) as min_trx_amt,
avg(trx_amt) as avg_trx_amt,
sum(trx_amt) as total_trx_amt
from cmb_usr_trx_rcd
where mch_nm='红玫瑰按摩保健休闲' and date(trx_time)between '2024-09-01' and '2024-09-30'
group by date(trx_time)
order by trx_date
2026-01-02 分组与聚合函数(2)擦边营收怎么样,聚合函数可看出 
select date(trx_time) as trx_date,
max(trx_time)as max_trx_amt,
min(trx_time) as min_trx_amt,
avg(trx_time) as avg_trx_amt,
sum(trx_time) as total_trx_amt
from cmb_usr_trx_rcd
where mch_nm='红玫瑰按摩保健休闲' and date(trx_time)between '2024-09-01' and '2024-09-30'
group by date(trx_time)
order by trx_date
2026-01-02 分组与聚合函数(2)擦边营收怎么样,聚合函数可看出 
select date(trx_time) as trx_date,
max(trx_time)as max_trx_amt,
min(trx_time) as min_trx_amt,
avg(trx_time) as avg_trx_amt,
sum(trx_time) as total_trx_amt
from cmb_usr_trx_rcd
where date(trx_time)between '2024-09-01' and '2024-09-30'
and mch_nm='红玫瑰按摩保健休闲'
group by date(trx_time)
order by trx_date
2026-01-02 分组与聚合函数(1)Money全都花在哪,GroupBy来查一查 
select mch_nm ,sum(trx_amt) as sum_trx_amt from cmb_usr_trx_rcd
where year(trx_time)='2024' and usr_id='5201314520'
group by mch_nm
order by sum_trx_amt desc
2026-01-02 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select * from cmb_usr_trx_rcd
where usr_id="5201314520" 
and date(trx_time) between '2024-09-01' and '2024-09-30'
order by trx_time
2026-01-02 条件过滤(1)异地男友有异常,数分闺蜜来帮忙 
select * from cmb_usr_trx_rcd
where usr_id="5201314520" 
and date(trx_time) between 2024-09-01 and 2024-09-30