Alan_Mathison_Turing的博客

SELECTselect * from product A join product_details B on A.id=B.id select * from product A left join product_details B on A.id=B.id第一个满足条件才列出，第二个不满足条件的B字段以null代替drop与truncate/delete drop 删除数据库或数据表（表结构，

1、安装 sudo yum install q-dba-pxc-5622、初始化3306配置sudo /home/q/mysql/scripts/mysql_install_file \--port 33063、配置环境变量 配置全局的在/etc/profile，配置个人的在~/.bashrcexport PATH="/home/q/mysql/bin:/home/q/pt/bin/:/home/