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更新练习七中回答率的定义

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2022-06-27 22:34:53 +08:00
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@@ -201,7 +201,7 @@
uid是用户id；action的值为：“show”， “answer”， “skip”；当action是"answer"时，answer_id不为空，相反，当action是"show"和"skip"时为空（null）；q_num是问题的数字序号。
写一条sql语句找出回答率最高的 `question_id`。
写一条sql语句找出回答率（`show 出现次数 / answer 出现次数`）最高的 `question_id`。
**举例：**