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//create table t1 CREATE TABLE `t1` (`id` bigint NOT NULL AUTO_INCREMENT,`author` varchar(40) NOT NULL,`comment` varchar(40) NOT NULL,`content` varcha 阅读全文
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//create table t1; create table t1(id bigserial not null primary key,author varchar(40) not null,comment varchar(40) not null,content varchar(40) not 阅读全文
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alter table table_name alter column column_name new_type CREATE TABLE public.t2 ( id serial primary key, name character varying(40) NOT NULL, author c 阅读全文
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//settings.json { "configurations": [ { "name": "Linux", "includePath": [ "${workspaceFolder}/**", "/usr/include/c++/13", "/usr/include/x86_64-linux-g 阅读全文
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sudo apt update; sudo apt upgrade; sudo apt install postgresql postgresql-contrib; sudo systemctl start postgresql.service https://www.digitalocean.co 阅读全文
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cannot open source file "stddef.h" (dependency of "chrono"). Please run the 'Select IntelliSense Configuration...' command to locate your system heade 阅读全文
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#include <iostream> void ignore_exceptions() { for(int i=-10;i<10;i++) { std::cout<<"i:"<<i<<", 100/i="<<100/i<<std::endl; } std::cout<<"Finished in " 阅读全文
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sudo apt install libmysqlcppconn-dev #include <algorithm> #include <atomic> #include <barrier> #include <bitset> #include <chrono> #include <ctime> #i 阅读全文
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mysql 5.7.16 installer download url for once click installation https://cdn.mysql.com/archives/mysql-installer/mysql-installer-community-5.7.16.0.msi 阅读全文
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1.Ubuntu install vscode; sudo snap install --classic codecode --version; 2.update upgrable upgrade sudo apt update; sudo apt list --upgradable; sudo a 阅读全文