LeetCode-SQL-534. 游戏玩法分析 III

SELECT C.player_id,C.event_date,C.games_played_so_far FROM ( SELECT A.player_id, A.event_date, @sum_cnt:= if(A.player_id = @pre_id AND A.event_date != @pre_date, @sum_cnt + A.games_played,

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