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"categoryTitle" : "Database" ,
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"title" : "Game Play Analysis I" ,
"titleSlug" : "game-play-analysis-i" ,
"content" : "<p>Table: <code>Activity</code></p>\n\n<pre>\n+--------------+---------+\n| Column Name | Type |\n+--------------+---------+\n| player_id | int |\n| device_id | int |\n| event_date | date |\n| games_played | int |\n+--------------+---------+\n(player_id, event_date) is the primary key of this table.\nThis table shows the activity of players of some games.\nEach row is a record of a player who logged in and played a number of games (possibly 0) before logging out on someday using some device.\n</pre>\n\n<p> </p>\n\n<p>Write an SQL query to report the <strong>first login date</strong> for each player.</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| player_id | device_id | event_date | games_played |\n+-----------+-----------+------------+--------------+\n| 1 | 2 | 2016-03-01 | 5 |\n| 1 | 2 | 2016-05-02 | 6 |\n| 2 | 3 | 2017-06-25 | 1 |\n| 3 | 1 | 2016-03-02 | 0 |\n| 3 | 4 | 2018-07-03 | 5 |\n+-----------+-----------+------------+--------------+\n<strong>Output:</strong> \n+-----------+-------------+\n| player_id | first_login |\n+-----------+-------------+\n| 1 | 2016-03-01 |\n| 2 | 2017-06-25 |\n| 3 | 2016-03-02 |\n+-----------+-------------+\n</pre>\n" ,
"translatedTitle" : "游戏玩法分析 I" ,
"translatedContent" : "<p>活动表 <code>Activity</code>： ， （ ,
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"lang" : "MySQL" ,
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"code" : "# Write your MySQL query statement below" ,
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"sampleTestCase" : "{\"headers\":{\"Activity\":[\"player_id\",\"device_id\",\"event_date\",\"games_played\"]},\"rows\":{\"Activity\":[[1,2,\"2016-03-01\",5],[1,2,\"2016-05-02\",6],[2,3,\"2017-06-25\",1],[3,1,\"2016-03-02\",0],[3,4,\"2018-07-03\",5]]}}" ,
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"Create table If Not Exists Activity (player_id int, device_id int, event_date date, games_played int)" ,
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"insert into Activity (player_id, device_id, event_date, games_played) values ('1', '2', '2016-03-01', '5')" ,
"insert into Activity (player_id, device_id, event_date, games_played) values ('1', '2', '2016-05-02', '6')" ,
"insert into Activity (player_id, device_id, event_date, games_played) values ('2', '3', '2017-06-25', '1')" ,
"insert into Activity (player_id, device_id, event_date, games_played) values ('3', '1', '2016-03-02', '0')" ,
"insert into Activity (player_id, device_id, event_date, games_played) values ('3', '4', '2018-07-03', '5')"
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