查詢最開始的登錄記錄

本題來自公衆號：SQL數據庫開發 https://mp.weixin.qq.com/s/qzYI_ZrIylznn8vvBE3SjA SELECT a.player_id,a.device_id from test01 a INNER JOIN (SELECT player_id,MIN(event_date) as ‘ss’ from test01 b GROUP BY player_id) c

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