在Hive表中，我有它们的实际销售额和预测。所以数据看起来像:itemdatesalesDolsalesUnitpredictionU11/1/20165.9910.911/1/20165.4910.912/1/20165.9910.8413/1/20166.0410.92为了计算平均价格，我这样做:createtabledata1asselectitem,date,predictionUfromdataJOIN(selectsum(salesDol)astotDol,sum(salesUnit)astotUnitfromdata);所以在每一行中我都有totDol和totUnit。现