MySQL命令显示所有可供查询的分类_MySQL

mysql> ? contents;
You asked for help about help category: "Contents"
For more information, type 'help ', where  is one of the following
categories:
 Account Management
 Administration
 Compound Statements
 Data Definition
 Data Manipulation
 Data Types
 Functions
 Functions and Modifiers for Use with GROUP BY
 Geographic Features
 Help Metadata
 Language Structure
 Plugins
 Procedures
 Storage Engines
 Table Maintenance
 Transactions
 User-Defined Functions
 Utility

mysql>