求用Linq或EF实现这个SQL语句一样的效果
删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录

                                                                            
[解决办法]
var ToDelete = db.people.GroupBy(x => x.peopleId).SelectMany(x => x.OrderBy(y => y.rowid).Skip(1));
foreach (var item in ToDelete) db.DeleteObject(item);
db.SaveChanges();