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SQL:从表中逐步计数惟一的访问

来源:互联网 

I have this table (visits):

我有这张桌子(参观):

id  |       fb_id    |   flipbook    | 
----     ----------      ---------     
1         1123           november2014        
2         1123           november2014      
3         1127           november2014       
4         1124           november2014    
5         1126           november2014            
6         1123           december2014
7         1124           december2014
8         1125           december2014
9         1123           january2015  
10         1124           january2015
11        1125           january2015
12         1123           february2015
13         1125           february2015
14        1124           february2015
15        1127           february2015
16        1129           march2015
17        1123           march2015
18        1123           march2015
19        1124           march2015
20        1125           march2015
21        1126           march2015
22        1128           march2015
id 



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