限定为某一年内时,按'年+月'分组去重与按'月'分组去重一样
实习广场投递简历分析(三)
https://www.nowcoder.com/practice/83f84aa5c32b4cf5a75558d02dd7743c
select t1.job job,first_year_mon,first_year_cnt,second_year_mon,second_year_cnt from (select job,date_format(date,'%Y-%m') first_year_mon,sum(num) first_year_cnt,date_format(date,'%m') fd from resume_info where date like '2025%' group by first_year_mon,job,fd) t1 join (select job,date_format(date,'%Y-%m') second_year_mon,sum(num) second_year_cnt,date_format(date,'%m') fd from resume_info where date like '2026%' group by second_year_mon,job,fd) t2 on t1.fd=t2.fd and t1.job=t2.job order by first_year_mon desc,job desc