HELP 命令
句法
MariaDB [(none)]> HELP search_string
描述
HELP
命令能在任何MariaDB / MySQL 客户端使用,比如 mysql 命令行客户端。能从这个帮助中获得几乎所有 mysql 命令和函数的句法和一个简短的描述。
如果你向 help 命令行提供参数,那么 mysql 客户端将会使用你提供的参数从服务器上查找相关内容。这个命令的使用需要在mysql数据库服务端初始化的时候安装包含有 help 帮助主题的数据表。
如果没有找到匹配的字符串,那么查找将会显示下面的内容:
MariaDB [(none)]> HELP something Nothing found Please try to run 'help contents' for a list of all accessible topics
使用 help contents 命令来查看帮助的分类:
MariaDB [(none)]> HELP 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 Language Structure Plugins Table Maintenance Transactions User-Defined Functions Utility
如果查找的字符串包含有多次,那么 mysql 将会显示找到的列表:
MariaDB [(none)]> help create Many help items for your request exist. To make a more specific request, please type 'help <item>', where <item> is one of the following topics: CREATE DATABASE CREATE EVENT CREATE FUNCTION CREATE FUNCTION UDF CREATE INDEX CREATE PROCEDURE CREATE SERVER CREATE TABLE CREATE TABLESPACE CREATE TRIGGER CREATE USER CREATE VIEW SHOW SHOW CREATE DATABASE SHOW CREATE EVENT SHOW CREATE FUNCTION SHOW CREATE PROCEDURE SHOW CREATE TABLE SPATIAL
使用一个完整查找字符来查看所有的详细信息。
帮助文档随 MariaDB 提供,存有帮助内容的数据库表可以从mysql_install_db
或者
fill_help_table.sql
脚本导入。
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