Listing 6.15[em]Using the GROUP BY Clause To Obtain Summary Information for Record Groups
SELECT SL.SalesID, Min(SL.Quantity * RT.Retail) AS Minsls,  _
     Max(SL.Quantity * RT.Retail) AS Maxsls,  _
     Avg(SL.Quantity * RT.Retail) AS Avgsls,  _
     Sum(SL.Quantity * RT.Retail) AS Totsls,  _
     Sum(SL.Quantity) AS Totvol  _
     FROM Sales AS SL, [Retail Items] AS RT  _
     WHERE SL.[Item Code]=RT.[Item Code]  _
     GROUP BY SL.SalesID