题解 | #未完成试卷数大于1的有效用户#
未完成试卷数大于1的有效用户
http://www.nowcoder.com/practice/46cb7a33f7204f3ba7f6536d2fc04286
select uid, count(*) - count(submit_time) as uncon, count(submit_time) as con, group_concat(distinct concat(date(start_time), ':', tag) separator ';') from exam_record join examination_info using (exam_id) where year(start_time) = 2021 group by uid having con >= 1 and uncon < 5 and uncon > 1 order by uncon desc
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