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题解 | 最受欢迎的top3课程

select ci.cid, count(*) as pv, sum(timestampdiff(MINUTE, start_time, end_time)) as time_len from course_info_tb ci inner join play...

2025-10-03

0 14

题解 | 分析每个员工在不同项目中的绩效情况

select e.employee_id, employee_name, performance_score as first_half_2024_score, row_number()over( partition by pf.project_id...

2025-09-30

0 17

题解 | 查询出每个运输方式在不同城市的平均运输时长以及总运输费用

select destination_city, transport_name, round(sum(timestampdiff(day,order_date,delivery_date))/count(*),2) as average_transport_duratio...

2025-09-30

0 14