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...
as shown in the figure, is this file so large because it contains multiple files? 2.js ...
as the title !important but if I write this, I can overwrite the following, which can take effect. Is there a big god to explain? ask for a big god answer I posted the whole code < html lang= "en " > < head > <meta charset="UTF-8...
the server is the centos7.0 server component is nginx when configuring a reverse proxy, if you want to add this line in the red box, will report an error. How to solve this problem ...
problem description I now need to control how the child component is displayed. I have obtained the object instance of the child component component, but how do I display this object in the template of the parent component? the environmental backgro...
this is the robots I generated with the love station tool. Txt file, detection shows that the rule is invalid, what is the reason ...