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...
when using three.js, use raycaster to select objects. If there is div occlusion on the upper layer of the canvas, the mouse can still select the model in the canvas. If you want to select a model that is not available when there is div occlusion, how to ...
see some materials: The index of mysql is divided into single-column index (primary key index, unique index, general index) and combined index. single-column index: an index contains only one column, and a table can have multiple single-column index...
can t I use it this way? Is there a big god who knows what the problem is? ...
is that I want to know that the ip requested right now is the proxy ip, not the ip of my host how do I know now? Agent crawler ip ...
Post-execution error message is as follows I type uwsgi-- socket: 4000-- plugin python-- module BNUZ_ALGYun.wsgi directly in that directory and there is no problem at all. I don t know how to write the configuration file. freshmen, I beg your ...