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86 lines
11 KiB
JSON
86 lines
11 KiB
JSON
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"questionId": "1245",
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"questionFrontendId": "1141",
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"categoryTitle": "Database",
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"boundTopicId": 33169,
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"title": "User Activity for the Past 30 Days I",
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"titleSlug": "user-activity-for-the-past-30-days-i",
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"content": "<p>Table: <code>Activity</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| user_id | int |\n| session_id | int |\n| activity_date | date |\n| activity_type | enum |\n+---------------+---------+\nThere is no primary key for this table, it may have duplicate rows.\nThe activity_type column is an ENUM of type ('open_session', 'end_session', 'scroll_down', 'send_message').\nThe table shows the user activities for a social media website. \nNote that each session belongs to exactly one user.\n</pre>\n\n<p> </p>\n\n<p>Write an SQL query to find the daily active user count for a period of <code>30</code> days ending <code>2019-07-27</code> inclusively. A user was active on someday if they made at least one activity on that day.</p>\n\n<p>Return the result table in <strong>any order</strong>.</p>\n\n<p>The query result format is in the following example.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> \nActivity table:\n+---------+------------+---------------+---------------+\n| user_id | session_id | activity_date | activity_type |\n+---------+------------+---------------+---------------+\n| 1 | 1 | 2019-07-20 | open_session |\n| 1 | 1 | 2019-07-20 | scroll_down |\n| 1 | 1 | 2019-07-20 | end_session |\n| 2 | 4 | 2019-07-20 | open_session |\n| 2 | 4 | 2019-07-21 | send_message |\n| 2 | 4 | 2019-07-21 | end_session |\n| 3 | 2 | 2019-07-21 | open_session |\n| 3 | 2 | 2019-07-21 | send_message |\n| 3 | 2 | 2019-07-21 | end_session |\n| 4 | 3 | 2019-06-25 | open_session |\n| 4 | 3 | 2019-06-25 | end_session |\n+---------+------------+---------------+---------------+\n<strong>Output:</strong> \n+------------+--------------+ \n| day | active_users |\n+------------+--------------+ \n| 2019-07-20 | 2 |\n| 2019-07-21 | 2 |\n+------------+--------------+ \n<strong>Explanation:</strong> Note that we do not care about days with zero active users.\n</pre>\n",
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"translatedTitle": "查询近30天活跃用户数",
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"translatedContent": "<p>活动记录表：<code>Activity</code></p>\n\n<pre>\n+---------------+---------+\n| Column Name | Type |\n+---------------+---------+\n| user_id | int |\n| session_id | int |\n| activity_date | date |\n| activity_type | enum |\n+---------------+---------+\n该表是用户在社交网站的活动记录。\n该表没有主键，可能包含重复数据。\nactivity_type 字段为以下四种值 ('open_session', 'end_session', 'scroll_down', 'send_message')。\n每个 session_id 只属于一个用户。\n</pre>\n\n<p> </p>\n\n<p>请写SQL查询出截至 <code>2019-07-27</code>（包含2019-07-27），近<strong> </strong><code>30</code> 天的每日活跃用户数（当天只要有一条活动记录，即为活跃用户）。</p>\n\n<p>以 <strong>任意顺序</strong> 返回结果表。</p>\n\n<p>查询结果示例如下。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入：</strong>\nActivity table:\n+---------+------------+---------------+---------------+\n| user_id | session_id | activity_date | activity_type |\n+---------+------------+---------------+---------------+\n| 1 | 1 | 2019-07-20 | open_session |\n| 1 | 1 | 2019-07-20 | scroll_down |\n| 1 | 1 | 2019-07-20 | end_session |\n| 2 | 4 | 2019-07-20 | open_session |\n| 2 | 4 | 2019-07-21 | send_message |\n| 2 | 4 | 2019-07-21 | end_session |\n| 3 | 2 | 2019-07-21 | open_session |\n| 3 | 2 | 2019-07-21 | send_message |\n| 3 | 2 | 2019-07-21 | end_session |\n| 4 | 3 | 2019-06-25 | open_session |\n| 4 | 3 | 2019-06-25 | end_session |\n+---------+------------+---------------+---------------+\n<strong>输出：</strong>\n+------------+--------------+ \n| day | active_users |\n+------------+--------------+ \n| 2019-07-20 | 2 |\n| 2019-07-21 | 2 |\n+------------+--------------+ <strong>\n解释：</strong>注意非活跃用户的记录不需要展示。</pre>\n",
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"sampleTestCase": "{\"headers\":{\"Activity\":[\"user_id\",\"session_id\",\"activity_date\",\"activity_type\"]},\"rows\":{\"Activity\":[[1,1,\"2019-07-20\",\"open_session\"],[1,1,\"2019-07-20\",\"scroll_down\"],[1,1,\"2019-07-20\",\"end_session\"],[2,4,\"2019-07-20\",\"open_session\"],[2,4,\"2019-07-21\",\"send_message\"],[2,4,\"2019-07-21\",\"end_session\"],[3,2,\"2019-07-21\",\"open_session\"],[3,2,\"2019-07-21\",\"send_message\"],[3,2,\"2019-07-21\",\"end_session\"],[4,3,\"2019-06-25\",\"open_session\"],[4,3,\"2019-06-25\",\"end_session\"]]}}",
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"metaData": "{\n \"mysql\": [\n \"Create table If Not Exists Activity (user_id int, session_id int, activity_date date, activity_type ENUM('open_session', 'end_session', 'scroll_down', 'send_message'))\"\n ],\n \"mssql\": [\n \"create table Activity (user_id int, session_id int, activity_date date, activity_type varchar(15) not null check(activity_type in ('open_session', 'end_session', 'scroll_down', 'send_message')))\"\n ],\n \"oraclesql\": [\n \"create table Activity (user_id int, session_id int, activity_date date, activity_type varchar(15) not null check(activity_type in ('open_session', 'end_session', 'scroll_down', 'send_message')))\",\n \"ALTER SESSION SET nls_date_format='YYYY-MM-DD'\"\n ],\n \"database\": true\n}",
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"Create table If Not Exists Activity (user_id int, session_id int, activity_date date, activity_type ENUM('open_session', 'end_session', 'scroll_down', 'send_message'))",
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"Truncate table Activity",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('1', '1', '2019-07-20', 'open_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('1', '1', '2019-07-20', 'scroll_down')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('1', '1', '2019-07-20', 'end_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('2', '4', '2019-07-20', 'open_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('2', '4', '2019-07-21', 'send_message')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('2', '4', '2019-07-21', 'end_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('3', '2', '2019-07-21', 'open_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('3', '2', '2019-07-21', 'send_message')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('3', '2', '2019-07-21', 'end_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('4', '3', '2019-06-25', 'open_session')",
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"insert into Activity (user_id, session_id, activity_date, activity_type) values ('4', '3', '2019-06-25', 'end_session')"
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"exampleTestcases": "{\"headers\":{\"Activity\":[\"user_id\",\"session_id\",\"activity_date\",\"activity_type\"]},\"rows\":{\"Activity\":[[1,1,\"2019-07-20\",\"open_session\"],[1,1,\"2019-07-20\",\"scroll_down\"],[1,1,\"2019-07-20\",\"end_session\"],[2,4,\"2019-07-20\",\"open_session\"],[2,4,\"2019-07-21\",\"send_message\"],[2,4,\"2019-07-21\",\"end_session\"],[3,2,\"2019-07-21\",\"open_session\"],[3,2,\"2019-07-21\",\"send_message\"],[3,2,\"2019-07-21\",\"end_session\"],[4,3,\"2019-06-25\",\"open_session\"],[4,3,\"2019-06-25\",\"end_session\"]]}}",
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