sql

SELECT     info.ShopID, info.AreaID, info.Name, info.VehicleInfo, info.OrderNo, info.Tel, info.Tag, info.Address, info.Description, info.RecommendInfo,
                      info.ShopMap, info.ImagePath, info.OriginalPrice, info.SalePrice, info.ImageName, info.CreateTime, info.IsRecommend, g.avgvalue,
                      dbo.School.SchoolName, dbo.ShopType.TypeName, dbo.ShopType.ParentID, info.SchoolID, dbo.ShopType.TypeID
FROM         dbo.ShopInfo AS info LEFT OUTER JOIN
                      dbo.School ON info.SchoolID = dbo.School.SchoolID LEFT OUTER JOIN
                      dbo.ShopType ON info.ShopTypeID = dbo.ShopType.TypeID LEFT OUTER JOIN
                          (SELECT     ShopID, AVG(Money) AS avgvalue
                            FROM          dbo.Grade
                            GROUP BY ShopID) AS g ON info.ShopID = g.ShopID




select aa.*,bb.test from info as aa,(select InfoID,avg(avgvalue) as test from grade group by gradeid)as  bb where aa.InfoID=bb.InfoID