two questions: Why the length of the int4 type of postgresql can reach 10 bits, but it is set to 32 bits in the attribute The int4 type length of postgresql is set to 32 bits by default, so why can t it be modified? it is still 32 bits after modif...
Integer a = 1; Integer b = 2; Long c = 3L; c = a compiler error will result in the error that int cannot be converted to long System.out.println (compiled normally, resulting in true Why? I know that when int and long add up, they both turn i...
The date selection component is referenced in the vue component, in which the parameter defaultDate, which is configured to select the current date by default, displays the current date by default. Now I want to implement any date brought from the paren...
<tr th:each="item:${list.rows}"> During the loop, when the array passed by the background is empty, the display has no data for the time being, but how can it be judged to be empty? here s what I wrote: but the page reported an error ...
import requests from bs4 import BeautifulSoup if __name__ == "__main__": headers = { User-Agent : Mozilla 5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit 537.36 (KHTML, like Gecko) Chrome 65.0.3325.181 Safari 537.36 QQBro...
When the data of scaling draws a histogram, why is the kde=True, ordinate greater than 1? ...
problem description vue websocket is encapsulated, and the component rendering completes sending data, which is faster than the websocket connection. How to solve it? the environmental background of the problems and what methods you have tried w...