题解
查询职位发布时间在2021年后或职位城市为上海的job_id, boss_id, company_id
https://www.nowcoder.com/practice/8beaed9f153d4f65acda4db12ae55ddd
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 00:00:00' UNION SELECT job_id, boss_id, company_id, job_city FROM job_info WHERE job_city = '上海' ) a ORDER BY a.job_city
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