创建 FOREIGN KEY 时出错答案

【问题标题】：Error on creating FOREIGN KEY创建 FOREIGN KEY 时出错
【发布时间】：2014-03-14 18:04:05
【问题描述】：

CREATE TABLE IF NOT EXISTS `servergraph_server` (
    `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT, 
    `name` VARCHAR(64) NOT NULL, 
    `ip` VARCHAR(16) NOT NULL, 
    `port` SMALLINT UNSIGNED NOT NULL
)

CREATE TABLE IF NOT EXISTS `servergraph_data` (
    `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT, 
    `serverid` INT NOT NULL, 
    `time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL, 
    `fps` SMALLINT UNSIGNED NOT NULL, 
    `replay` TINYINT UNSIGNED NOT NULL, 
    `dropped_packets` INT UNSIGNED NOT NULL, 
    `online` TINYINT UNSIGNED NOT NULL, 
    `clients0` TINYINT UNSIGNED NOT NULL, 
    `clients1` TINYINT UNSIGNED NOT NULL, 
    `clients2` TINYINT UNSIGNED NOT NULL, 
    `clients3` TINYINT UNSIGNED NOT NULL, 
    FOREIGN KEY (`serverid`) REFERENCES `servergraph_server` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
)

这是我要创建的表。

但我总是在 FOREIGN KEY 行上遇到错误。

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 'FOREIG' at line 1

我正在使用这个版本的 MySQL：5.5.35-0+wheezy1

怎么了？

谢谢你，弗洛贝

解决方案：

ALTER TABLE `servergraph_data` ADD CONSTRAINT `fk_server` FOREIGN KEY (`serverid`) REFERENCES `servergraph_server` (`id`)

而不是 CREATE TABLE servergraph_data 中的 FOREIGN KEY 行

【问题讨论】：

您是否将其作为脚本执行？
不，我从插件内部执行它们，但它支持 MySQL
您的 DDL 有效：sqlfiddle.com/#!2/8702e 正在发生其他事情。

标签： mysql sql reference foreign-keys create-table

【解决方案1】：

在创建表语句后放置分号：

CREATE TABLE IF NOT EXISTS `servergraph_server` (
    `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT, 
    `name` VARCHAR(64) NOT NULL, 
    `ip` VARCHAR(16) NOT NULL, 
    `port` SMALLINT UNSIGNED NOT NULL
);

CREATE TABLE IF NOT EXISTS `servergraph_data` (
    `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT, 
    `serverid` INT NOT NULL, 
    `time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL, 
    `fps` SMALLINT UNSIGNED NOT NULL, 
    `replay` TINYINT UNSIGNED NOT NULL, 
    `dropped_packets` INT UNSIGNED NOT NULL, 
    `online` TINYINT UNSIGNED NOT NULL, 
    `clients0` TINYINT UNSIGNED NOT NULL, 
    `clients1` TINYINT UNSIGNED NOT NULL, 
    `clients2` TINYINT UNSIGNED NOT NULL, 
    `clients3` TINYINT UNSIGNED NOT NULL, 
    FOREIGN KEY (`serverid`) REFERENCES `servergraph_server` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
);

【讨论】：