Table: Activity
+--------------+---------+ | Column Name | Type | +--------------+---------+ | player_id | int | | device_id | int | | event_date | date | | games_played | int | +--------------+---------+ (player_id, event_date) is the primary key of this table. This table shows the activity of players of some games. Each 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.
Write an SQL query to report the device that is first logged in for each player.
Return the result table in any order.
The query result format is in the following example.
Example 1:
Input: Activity table: +-----------+-----------+------------+--------------+ | player_id | device_id | event_date | games_played | +-----------+-----------+------------+--------------+ | 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 | +-----------+-----------+------------+--------------+ Output: +-----------+-----------+ | player_id | device_id | +-----------+-----------+ | 1 | 2 | | 2 | 3 | | 3 | 1 | +-----------+-----------+
# Write your MySQL query statement below
select
player_id,
device_id
from
Activity
where
(player_id, event_date) in (
select
player_id,
min(event_date) event_date
from
Activity
group by
player_id
)