pyspark 分組取前幾個(已解決)

pyspark 怎樣根據user_id和item_id分組，然後去到時間最新的前兩個數據？？？？？ 方法一 sql = "select item_id, user_id, create_time from (select item_id, user_id, create_time, row_number()\ over (partition by user_id,item_id order by

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