题目链接:点击打开链接
题目大意:略。
解题思路:略。
AC 代码
SELECT IFNULL(ROUND(COUNT(DISTINCT session_id)/COUNT(DISTINCT user_id), 2), 0.0) average_sessions_per_user
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30
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题目链接:点击打开链接
题目大意:略。
解题思路:略。
AC 代码
SELECT IFNULL(ROUND(COUNT(DISTINCT session_id)/COUNT(DISTINCT user_id), 2), 0.0) average_sessions_per_user
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30
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