将去重后的两个连接表作为一个临时表t,然后再进行排序select job_id,boss_id,company_id from(select job_id,boss_id,company_id,job_city from job_info where post_time > "2021-01-01"unionselect job_id,boss_id,company_id,job_city from job_info where job_city = "上海") torder by t.job_city;