查看系统帮助
help contents
?
mysql> help contents;You asked for help about help category: "Contents"For more information, type 'help <item>', where <item> is one of the followingcategories: 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 |
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查看数据类型
help data types
?
mysql> help data types;You asked for help about help category: "Data Types"For more information, type 'help <item>', where <item> is one of the followingtopics: AUTO_INCREMENT BIGINT BINARY BIT BLOB BLOB DATA TYPE BOOLEAN CHAR CHAR BYTE DATE DATETIME DEC DECIMAL DOUBLE DOUBLE PRECISION ENUM FLOAT INT INTEGER LONGBLOB LONGTEXT MEDIUMBLOB MEDIUMINT MEDIUMTEXT SET DATA TYPE SMALLINT TEXT TIME TIMESTAMP TINYBLOB TINYINT TINYTEXT VARBINARY VARCHAR YEAR DATA TYPE |
查看整数
?
mysql> help 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: http://dev.mysql.com/doc/refman/5.7/en/numeric-type-overview.htmlmysql> help tinyint;Name: 'TINYINT'Description:TINYINT[(M)] [UNSIGNED] [ZEROFILL]A very small integer. The signed range is -128 to 127. The unsignedrange is 0 to 255.URL: http://dev.mysql.com/doc/refman/5.7/en/numeric-type-overview.html |
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