题解 | #统计作答次数#

统计作答次数

https://www.nowcoder.com/practice/45a87639110841b6950ef6a12d20175f

SELECT
  COUNT(id) AS total_pv,
  SUM(IF(submit_time IS NOT NULL AND score IS NOT NULL, 1, 0)) AS complete_pv,
  (select count(distinct exam_id) from exam_record 
   where submit_time IS NOT NULL AND score IS NOT NULL) AS complete_exam_cn
FROM
  exam_record;

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