题解 | #某乎问答回答过教育类问题的用户里有多少用户回答过职场类问题#
某乎问答回答过教育类问题的用户里有多少用户回答过职场类问题
http://www.nowcoder.com/practice/b02cf9ee7b9f4cdda308f8155ff3415d
#回答过教育问题的用户id select count(distinct a.author_id) from answer_tb a left join issue_tb i on a.issue_id=i.issue_id where i.issue_type='Education' and a.author_id in (#回答过职场问题的用户id select a.author_id from answer_tb a left join issue_tb i on a.issue_id=i.issue_id where i.issue_type='Career')
投递韶音科技等公司7个岗位
