应该这样做：
SELECt report_id, computer_id, date_enteredFROM reports AS aWHERe date_entered = ( SELECt MAX(date_entered) FROM reports AS b WHERe a.report_id = b.report_id AND a.computer_id = b.computer_id)
应该这样做：
SELECt report_id, computer_id, date_enteredFROM reports AS aWHERe date_entered = ( SELECt MAX(date_entered) FROM reports AS b WHERe a.report_id = b.report_id AND a.computer_id = b.computer_id)
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