mySQL create table 语句中我的语法错误是什么？

Question

我正在输入以下内容：

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;

我收到以下回复：

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，但我很难过。我的枚举语句有什么问题？

Answer 1

通过 Single Quote

在 ENUM 中包含数据

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 MySQL 保留关键字 。当您使用 MySQL RESERVED KEYWORDS 作为标识符时，建议使用 backtick 括起来。

Answer 2

问题出在您用于 ENUM 值的引号 (‘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确保用户 table 存在并且具有列 username;

Answer 3

变化：

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

收件人：

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

Answer 4

在枚举中使用单引号而不是反引号。这对我有用：

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

改变

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

至

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

在“”的情况下使用“”。

mySQL create table 语句中我的语法错误是什么？

What is my syntax error in this mySQL create table statement?

mysql

create-table