mysql下查看帮助

SQL分类#

DDL:data definition languages ,数据定义语言,常用的语句关键字create,drop,alter等。
DML:data manipulation languages,数据操纵语言,用于增,删,改,查,常用的语句关键字insert,delete,update,select等。
DCL:data control languages,数据控制语言,定义访问权限,安全级别,常用的语句关键字grant,revoke等。

mysql查看帮助#

按照层次查看#

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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

mysql> ? Account Management
You asked for help about help category: "Account Management"
For more information, type 'help <item>', where <item> is one of the following
topics:
ALTER USER
CREATE USER
DROP USER
GRANT
RENAME USER
REVOKE
SET PASSWORD

快速查看#

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mysql> ? select
Name: 'SELECT'
Description:
Syntax:
SELECT
[ALL | DISTINCT | DISTINCTROW ]
[HIGH_PRIORITY]
[STRAIGHT_JOIN]
[SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT]
[SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]
select_expr [, select_expr ...]
[FROM table_references
[PARTITION partition_list]
[WHERE where_condition]
[GROUP BY {col_name | expr | position}
[ASC | DESC], ... [WITH ROLLUP]]
[HAVING where_condition]
[ORDER BY {col_name | expr | position}
[ASC | DESC], ...]
[LIMIT {[offset,] row_count | row_count OFFSET offset}]
[PROCEDURE procedure_name(argument_list)]
[INTO OUTFILE 'file_name'
[CHARACTER SET charset_name]
export_options
| INTO DUMPFILE 'file_name'
| INTO var_name [, var_name]]
[FOR UPDATE | LOCK IN SHARE MODE]]