mysql客户端帮助

mysql>help search_string

如果为help命令提供参数，则mysql将其用作搜索字符串，以从《 MySQL参考手册》中提供帮助内容。该命令要求使用帮助主题信息来初始化mysql数据库中的help表 。

如果搜索字符串不匹配，则搜索失败：

mysql> help me

Nothing found

Please try to run 'help contents' for a list of all accessible topics

使用帮助内容可以查看帮助类型的列表：

mysql> help contents

You asked for help about help category: "Contents"

For more information, type 'help ', where is one of the

following categories:

Account Management

Administration

Data Definition

Data Manipulation

Data Types

Functions

Functions and Modifiers for Use with GROUP BY

Geographic Features

Language Structure

Plugins

Storage Engines

Stored Routines

Table Maintenance

Transactions

Triggers

如果搜索字符串匹配多个项目，则 mysql显示匹配主题的列表：

mysql> help logs

Many help items for your request exist.

To make a more specific request, please type 'help ',

where is one of the following topics:

SHOW

SHOW BINARY LOGS

SHOW ENGINE

SHOW LOGS

使用主题作为搜索字符串以查看该主题的帮助条目：

mysql> help show binary logs

Name: 'SHOW BINARY LOGS'

Description:

Syntax:

SHOW BINARY LOGS

SHOW MASTER LOGS

Lists the binary log files on the server. This statement is used as

part of the procedure described in [purge-binary-logs], that shows how

to determine which logs can be purged.

mysql> SHOW BINARY LOGS;

+---------------+-----------+-----------+

| Log_name | File_size | Encrypted |

+---------------+-----------+-----------+

| binlog.000015 | 724935 | Yes |

| binlog.000016 | 733481 | Yes |

+---------------+-----------+-----------+

搜索字符串可以包含通配符 %和_。这些具有与操作员执行LIKE的模式匹配具有操作相同的含义。例如， HELP rep%返回以开头的主题列表rep：

mysql> HELP rep%

Many help items for your request exist.

To make a more specific request, please type 'help ',

where is one of the following

topics:

REPAIR TABLE

REPEAT FUNCTION

REPEAT LOOP

REPLACE

REPLACE FUNCTION