文章目錄

• 一、查詢幫助文檔
• 二、MySQL 相關資源網址

一、查詢幫助文檔

輸入命令 ? contents 或者 help contents 來顯示所有可供查詢的分類：

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 ManagementAdministrationCompound StatementsContentsData DefinitionData ManipulationData TypesFunctionsGeographic FeaturesHelp MetadataLanguage StructurePluginsProceduresStorage EnginesTable MaintenanceTransactionsUser-Defined FunctionsUtility

接著，你可以繼續查詢相關的分類，例如查看數據庫支持的數據類型，可以輸入命令 ? data types：

mysql> ? data types; You asked for help about help category: "Data Types" For more information, type 'help <item>', where <item> is one of the following topics:AUTO_INCREMENTBIGINTBINARYBITBLOBBLOB DATA TYPEBOOLEANCHARCHAR BYTEDATEDATETIMEDECDECIMALDOUBLEDOUBLE PRECISIONENUMFLOATINTINTEGERLONGBLOBLONGTEXTMEDIUMBLOBMEDIUMINTMEDIUMTEXTSET DATA TYPESMALLINTTEXTTIMETIMESTAMPTINYBLOBTINYINTTINYTEXTVARBINARYVARCHARYEAR DATA TYPE

如果想知道 int 類型的具體介紹，可以輸入命令 ? int：

mysql> ? int Name: 'INT' Description: INT[(M)] [UNSIGNED] [ZEROFILL]A normal-size integer. The signed range is -2147483648 to 2147483647. The unsigned range is 0 to 4294967295.URL: https://dev.mysql.com/doc/refman/5.6/en/numeric-type-overview.html

查看數據庫的函數分類，輸入命令 ? functions：

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 FunctionsComparison OperatorsControl Flow FunctionsDate and Time FunctionsEncryption FunctionsGROUP BY Functions and ModifiersInformation FunctionsLocking FunctionsLogical OperatorsMiscellaneous FunctionsNumeric FunctionsSpatial FunctionsString Functions

查看某個具體函數的使用說明，例如查看ifnull函數的使用說明，輸入命令 ? ifnull：

mysql> ? ifnull; Name: 'IFNULL' Description: Syntax: IFNULL(expr1,expr2)If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2.URL: https://dev.mysql.com/doc/refman/5.6/en/control-flow-functions.htmlExamples: mysql> SELECT IFNULL(1,0);-> 1 mysql> SELECT IFNULL(NULL,10);-> 10 mysql> SELECT IFNULL(1/0,10);-> 10 mysql> SELECT IFNULL(1/0,'yes');-> 'yes'

查看數據庫命令的詳細說明，例如查看命令 show 的使用說明，輸入命令 ? show：

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 AUTHORS 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 CONTRIBUTORS SHOW CREATE DATABASE db_name SHOW CREATE EVENT event_name SHOW CREATE FUNCTION func_name SHOW CREATE PROCEDURE proc_name SHOW CREATE TABLE tbl_name SHOW CREATE TRIGGER trigger_name SHOW CREATE VIEW view_name SHOW DATABASES [like_or_where] SHOW ENGINE engine_name {STATUS | MUTEX} SHOW [STORAGE] ENGINES SHOW ERRORS [LIMIT [offset,] row_count] SHOW EVENTS SHOW FUNCTION CODE func_name SHOW FUNCTION STATUS [like_or_where] SHOW GRANTS FOR user SHOW INDEX FROM tbl_name [FROM db_name] SHOW MASTER STATUS SHOW OPEN TABLES [FROM db_name] [like_or_where] SHOW PLUGINS SHOW PROCEDURE CODE proc_name SHOW PROCEDURE STATUS [like_or_where] SHOW PRIVILEGES SHOW [FULL] PROCESSLIST SHOW PROFILE [types] [FOR QUERY n] [OFFSET n] [LIMIT n] SHOW PROFILES SHOW RELAYLOG EVENTS [IN 'log_name'] [FROM pos] [LIMIT [offset,] row_count] SHOW SLAVE HOSTS SHOW SLAVE STATUS SHOW [GLOBAL | SESSION] STATUS [like_or_where] SHOW TABLE STATUS [FROM db_name] [like_or_where] SHOW [FULL] TABLES [FROM db_name] [like_or_where] SHOW TRIGGERS [FROM db_name] [like_or_where] SHOW [GLOBAL | SESSION] VARIABLES [like_or_where] SHOW WARNINGS [LIMIT [offset,] row_count]like_or_where:LIKE 'pattern'| WHERE exprIf the syntax for a given SHOW statement includes a LIKE 'pattern' part, 'pattern' is a string that can contain the SQL % and _ wildcard characters. The pattern is useful for restricting statement output to matching values.Several SHOW statements also accept a WHERE clause that provides more flexibility in specifying which rows to display. See https://dev.mysql.com/doc/refman/5.6/en/extended-show.html.URL: https://dev.mysql.com/doc/refman/5.6/en/show.html

如果想查看 create table 的語法, 可以使用以下命令 create table：

mysql> ? create table; Name: 'CREATE TABLE' Description: Syntax: CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name(create_definition,...)[table_options][partition_options]CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name[(create_definition,...)][table_options][partition_options][IGNORE | REPLACE][AS] query_expressionCREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name{ LIKE old_tbl_name | (LIKE old_tbl_name) }create_definition:col_name column_definition| {INDEX|KEY} [index_name] [index_type] (key_part,...)[index_option] ...| {FULLTEXT|SPATIAL} [INDEX|KEY] [index_name] (key_part,...)[index_option] ...

二、MySQL 相關資源網址

https://dev.mysql.com/downloads/：是MySQL的官方網站, 可以下載到各個版本的MySQL以及相關客戶端開發工具等.
https://dev.mysql.com/doc/：提供了目前最權威的MySQL數據庫及工具的在線手冊
https://bugs.mysql.com/：這里可以查看到MySQL已經發布的bug列表, 或者向MySQL提交bug報告
https://www.mysql.com/news-and-events/newsletter/：通常會發布各種關于MySQL的最新消息.

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