MYSQL教程:MySQL Show命令
show tables或show tables from database_name; 解释：显示当前数据库中所有表的名称 show databases; 解释：显示mysql中所有数据库的名称 show processlist; 解释：显示系统中正在运行的所有进程，也就是当前正在执行的查询。大多数用户可以查看 他们自己的
show tables或show tables from database_name;
解释：显示当前数据库中所有表的名称
show databases;
解释：显示mysql中所有数据库的名称
show processlist;
解释：显示系统中正在运行的所有进程，也就是当前正在执行的查询。大多数用户可以查看
他们自己的进程，但是如果他们拥有process权限，就可以查看所有人的进程，包括密码。
show table status;
解释：显示当前使用或者指定的database中的每个表的信息。信息包括表类型和表的最新更新时间
show columns from table_name from database_name; 或show columns from database_name.table_name;
解释：显示表中列名称
show grants for user_name@localhost;
解释：显示一个用户的权限，显示结果类似于grant 命令
show index from table_name;
解释：显示表的索引
show status;
解释：显示一些系统特定资源的信息，，例如，正在运行的线程数量
show variables;
解释：显示系统变量的名称和值
show privileges;
解释：显示服务器所支持的不同权限
show create database database_name;
解释：显示create database 语句是否能够创建指定的数据库
show create table table_name;
解释：显示create database 语句是否能够创建指定的数据库
show engies;
解释：显示安装以后可用的存储引擎和默认引擎。
show innodb status;
解释：显示innoDB存储引擎的状态
show logs;
解释：显示BDB存储引擎的日志
show warnings;
解释：显示最后一个执行的语句所产生的错误、警告和通知
show errors;
解释：只显示最后一个执行语句所产生的错误
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