Solution 1
利用上一题(511)的结果作为子查询
SELECT player_id, device_id
FROM Activity
WHERE (player_id, event_date) IN (
SELECT player_id, MIN(event_date)
FROM Activity
GROUP BY player_id
);
Last updated
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利用上一题(511)的结果作为子查询
SELECT player_id, device_id
FROM Activity
WHERE (player_id, event_date) IN (
SELECT player_id, MIN(event_date)
FROM Activity
GROUP BY player_id
);
Last updated
Was this helpful?