mysql使用笔记(网易Mysql实用手册)---1

1帮助使用

1.1按层次查看帮助

　　1 当不知道帮助可提供什么时，可通过MySQL内置帮助文档，一层层往下看。

　　命令：

　mysql> ? contents

　　? 等效help，该文档涵盖了数据库操作的大部分主题，每个大类又包括更小粒度的类，类最后有具体的topic组成。

　　2 查询结果：

mysql> ? contents;
You asked for help about help category: "Contents"
For more information, type 'help <item>', where <item> 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

　　3 查询下一层

mysql> ? Functions
You asked for help about help category: "Functions"
For more information, type 'help <item>', where <item> is one of the following
categories:
   Bit Functions
   Comparison operators
   Control flow functions
   Date and Time Functions
   Encryption Functions
   Information Functions
   Logical operators
   Miscellaneous Functions
   Numeric Functions
   String Functions

1.2快速查看帮助

　　使用中，需要快速查阅某项语法时，使用关键字进行快速查询。如查询show命令能查看什么，使用如下命令：

mysql> ? show
Name: 'SHOW'
Description:
SHOW has many forms that provide information about databases, tables,
columns, or status information about the server. This section describes
those following:
 
SHOW {BINARY | MASTER} LOGS
SHOW BINLOG EVENTS [IN 'log_name'] [FROM pos] [LIMIT [offset,] row_count]
SHOW CHARACTER SET [like_or_where]
SHOW COLLATION [like_or_where]
SHOW [FULL] COLUMNS FROM tbl_name [FROM db_name] [like_or_where]
SHOW CREATE DATABASE db_name
SHOW CREATE EVENT event_name
SHOW CREATE FUNCTION func_name
SHOW CREATE PROCEDURE proc_name

　　类似，可查询其他语法如：

mysql> ? create table