select ji.job_id,ji.boss_id,ji.company_id,ji.post_time,ji.salary,ji.job_city from job_info ji left join deliver_record dr on ji.job_id = dr.job_id 
group by ji.company_id,ji.job_id,ji.boss_id,ji.post_time,ji.job_city,ji.salary

题目描述有问题吧