FROM INNER JOIN (SELECT [Customer Name], MIN([Order Date]) AS Original_Order_Date FROM GROUP BY [Customer Name]) Ori_Ordate ON Orders.[Customer Name] = Ori_Ordate.[Customer Name] SQL的内容其实非常简单,主要是为了拿到每个客户的第一购买时间 SELECT [Customer Name], MIN([Order Date]) AS Original_Order_Date --取得客户首次购买时间 FROM