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Game Play Analysis ITable: ActivityColumn NameTypeplayer_idintdevice_idintevent_datedategames_playedint(player_id, event_date) is the primary key of this table.This table shows the activity of players of some game. Each row is a record of a player who logged in and played a number of games (possibly 0) before logging out on some day using some device.Write an SQL query that reports the first login date for each player.The query result format is in the following example:Activity table:player_iddevice_idevent_idgames_played122016-03-015122016-05-026232017-06-251312016-03-020342018-07-035Result table:player_idfirst_login12016-03-0122017-06-2532016-03-02Optionsselect player_id, min(event_date) as first_loginfrom Activityby player_idorder by player_id;select player_id, min(event_date) as first_loginfrom Activitygroup by player_idorder by player_id;select player_id, min(event_date) as first_loginof Activitygroup by player_idorder by player_id;select min(event_date) as first_loginfrom Activitygroup by player_idorder by player_id;

Question

Game Play Analysis ITable: ActivityColumn NameTypeplayer_idintdevice_idintevent_datedategames_playedint(player_id, event_date) is the primary key of this table.This table shows the activity of players of some game. Each row is a record of a player who logged in and played a number of games (possibly 0) before logging out on some day using some device.Write an SQL query that reports the first login date for each player.The query result format is in the following example:Activity table:player_iddevice_idevent_idgames_played122016-03-015122016-05-026232017-06-251312016-03-020342018-07-035Result table:player_idfirst_login12016-03-0122017-06-2532016-03-02Optionsselect player_id, min(event_date) as first_loginfrom Activityby player_idorder by player_id;select player_id, min(event_date) as first_loginfrom Activitygroup by player_idorder by player_id;select player_id, min(event_date) as first_loginof Activitygroup by player_idorder by player_id;select min(event_date) as first_loginfrom Activitygroup by player_idorder by player_id;

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Solution

The correct SQL query to get the first login date for each player is:

select player_id, min(event_date) as first_login
from Activity
group by player_id
order by player_id;

Here's the step by step explanation:

  1. select player_id, min(event_date) as first_login: This line is selecting the player_id and the minimum (or first) event_date for each player. The min(event_date) function returns the earliest date from the event_date column. The as first_login is just renaming the column in the output.

  2. from Activity: This line is specifying the table that we are selecting the data from, which is the Activity table.

  3. group by player_id: This line is grouping the selected data by the player_id. This means that the query will return one row for each player_id.

  4. order by player_id;: This line is ordering the output rows by the player_id. This makes it easier to find a specific player in the output.

This problem has been solved

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