日期:2014-05-16  浏览次数:20460 次

新增独立用户数
继续问个问题,

比方说这个表 A           ID       用户名              TIME                         总表B    得到 新用户数
                                    1             aa                     2014.1.1
                                    2             bb                   2014.1.1
                                   3               cc                   2014.1.1                                              3
                                    4              aa                   2014.1.2
                                    5             dd                     2014.1.2                                             1
                                   6                ee                    2014.1.3                                            1
                      &n