我的mySQL create table语句中的语法错误是什么？

Question

我输入以下内容：

CREATE TABLE events (
`id` mediumint unsigned not null auto_increment,
`user` varchar(30) not null,
`time` datetime not null,
`duration` decimal(5,2) default 1.0,
`title` tinytext not null,
`location` text default null,
`tag` ENUM(‘red’,’orange’,’yellow’,’green’,’blue’,’violet’,’brown’,’black’) default null,
PRIMARY KEY (`id`),
FOREIGN KEY (`user`) references users (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

我得到以下回应：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '‘red’,’orange’,’yellow’,’green’,’blue’,’violet’,’brown' at line 8

这可能是眼睛疲劳的情况，但我很沮丧。 我的enum语句有什么问题？

Answer 1

用Single Quote将数据括在ENUM

CREATE TABLE `events` (
`id` mediumint unsigned not null auto_increment,
`user` varchar(30) not null,
`time` datetime not null,
`duration` decimal(5,2) default 1.0,
`title` tinytext not null,
`location` text default null,
`tag` ENUM('red','orange','yellow','green','blue','violet','brown','black') default null,
PRIMARY KEY (`id`),
FOREIGN KEY (`user`) references users (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

注意： event是一个MySQL RESERVED KEYWORD 。 当您使用MySQL RESERVED KEYWORDS作为标识符时，建议使用backtick将其backtick 。

Answer 2

更改：

`tag` ENUM(‘red’,’orange’,’yellow’,’green’,’blue’,’violet’,’brown’,’black’) 

至：

`tag` ENUM('red', 'orange','yellow','green','blue','violet','brown','black') 

Answer 3

问题在于您用于ENUM值的双引号（ 'red' ）试试这个;）

CREATE TABLE events (
`id` mediumint unsigned not null auto_increment,
`user` varchar(30) not null,
`time` datetime not null,
`duration` decimal(5,2) default 1.0,
`title` tinytext not null,
`location` text default null,
`tag` ENUM('red','orange','yellow','green','blue','violet','brown','black') default null,
PRIMARY KEY (`id`),
FOREIGN KEY (`user`) references users (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

并且在执行此查询之前，请确保users表存在并且具有列用户名。

Answer 4

在枚举中使用单引号而不是反引号。 这为我工作：

CREATE TABLE events ( `id` mediumint unsigned not null auto_increment, `user` varchar(30) not null, `time` datetime not null, `duration` decimal(5,2) default 1.0, `title` tinytext not null, `location` text default null, `tag` ENUM('red','orange','yellow','green','blue','violet','brown','black') default null,  PRIMARY KEY (`id`), FOREIGN KEY (`user`) references users (`username`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Answer 5

更改

`tag` ENUM(‘red’,’orange’,’yellow’,’green’,’blue’,’violet’,’brown’,’black’)

至

`tag` ENUM('red','orange','yellow','green','blue','violet','brown','black')

如果是，请使用。