我有这种形式的表....
Date: User ID:
02/11/2015 9:02 1283577
02/11/2015 9:03 1006768
02/11/2015 9:03 1006768
02/11/2015 9:03 1006768
02/11/2015 9:09 1284033
02/11/2015 9:09 1284033
02/11/2015 9:10 1284033
02/11/2015 9:10 1284033
02/11/2015 9:11 1006824
02/11/2015 9:11 1006824
02/11/2015 9:11 1284033
02/11/2015 9:11 1284033
02/11/2015 9:12 1006824
02/11/2015 9:12 1006824
02/11/2015 9:27 45838
02/11/2015 9:27 45838
02/11/2015 9:27 45838
02/11/2015 9:28 45838
02/11/2015 9:28 45838
得到这样的东西......
Date: User ID:
02/11/2015 9:02 1283577
02/11/2015 9:03 1006768
02/11/2015 9:10 1284033
02/11/2015 9:11 1006824
02/11/2015 9:11 1284033
02/11/2015 9:12 1006824
02/11/2015 9:28 45838
基本上删除当天用户ID重复的所有行。我有几个月的数据所以这只是它的一部分...
有没有办法做到这一点