was originally intended to use redis s HyperLogLog for statistics, but since users only have one chance to like each article, it is impossible to keep playing redis to determine whether users have liked it or not. But the efficiency of using mysql is to...
there is a sample, column an is the number, column b is the number of occurrence of the number, the sample is very large, the standard deviation and normal distribution map of this sample is required, how should we deal with it with python? I ve checked...
city id name 1 Beijing 2 Shanghai 3 Tianjin news Newslist id name city 1 my 1 2 my 2 3 my 2 4 my 3 find out how many messages are there in Beijing how many messages are there in Shanghai how many messages are there in Tianjin ...
Reading websites often have today s page views, today s posts, today s comments and so on. Which statistical scheme is better? file + Cookie mode, the file on the server is emptied once in 24 hours. the dat file is accessed only once by the client...
recently, we are going to do a statistics on the activity of the industry in the project, and the three factors that affect the activity of the industry are the number of posts issued by the industry, the number of comments on the information of the indu...