MySQL内置help解析（SQL语句说明书）
root@db02 scripts]# mysql -uroot -S /data/3306/mysql.sockWelcome to the MySQL monitor.Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.36 Source distribution
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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> ? contents##我们不知道怎么用，就问系统，你都有什么内容，下面就是它反馈给你的内容
Account Management ##账户管理
Administration###管理
Compound Statements ##复合语句
Data Definition ##数据定义
Data Manipulation##数据操作
Data Types ##数据类型
Functions##功能
Functions and Modifiers for Use with GROUP BY##与组一起使用的函数和修饰符
Geographic Features ##地理特征
Help Metadata ##帮助元数据
Language Structure ##语言结构
Plugins ##插件
Procedures ##程序
Storage Engines ##存储引擎
Table Maintenance ##表维护
Transactions##交易
User-Defined Functions##用户定义的函数
Utility##效用
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