本文給大家詳細講述的是mysql的help（幫助）命令的用法，非常細致，有需要的小伙伴可以來參考下
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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?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</item></item>
幫助文檔的目錄列表
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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?following topics: ??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</item></item>
查看mysql
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.html mysql>?help?tinyint; Name:?'TINYINT' Description: TINYINT[(M)]?[UNSIGNED]?[ZEROFILL] A?very?small?integer.?The?signed?range?is?-128?to?127.?The?unsigned range?is?0?to?255. URL:?http://dev.mysql.com/doc/refman/5.7/en/numeric-type-overview.html
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