题解 | #实习广场投递简历分析(三)#

with t1 as(
select id,job,date_format(date,'%Y-%m') as date,num
    from resume_info
),
job_2025 as (
select job,date as first_year_mon,sum(num) as first_year_cnt
from t1
where date<'2026-01-01'
group by job,date 
order by date desc,job desc
),
job_2026 as (
select job,date as second_year_mon,sum(num) as second_year_cnt
    from t1
    where date>='2026-01'
    and date<'2027-01'
    group by job,date 
    order by date desc,job desc
)
select a.job,first_year_mon,first_year_cnt,second_year_mon,second_year_cnt
from job_2025 a 
left join job_2026 b 
on a.job=b.job and right(second_year_mon,2)=right(first_year_mon,2)
where first_year_mon<'2026-01'
group by first_year_mon,job 
order by first_year_mon desc,job desc