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MongoDB C驱动程序不会返回任何聚合查询结果
我有以下SQL查询: SELECT SUM(“PAYMENT_HISTORY” . “AMOUNT_PAID”)FROM“PAYMENT_HISTORY”WHERE((“PAYMENT_HISTORY”.YEAR> = 2011)AND(“PAYMENT_HISTORY”.YEAR <= 2013)AND(“PAYMENT_HISTORY” . “AMOUNT_PAID”> = ...