我要让3个表所示:什么是可能使用一个参考场为多个外键约束
wc_groups表
CREATE TABLE IF NOT EXISTS `wc_groups` (
`id` int(2) unsigned NOT NULL AUTO_INCREMENT,
`idgroup` int(7) NOT NULL,
`title` varchar(10) NOT NULL,
`content` text,
`status` smallint(1) NOT NULL DEFAULT '1',
PRIMARY KEY (`id`),
UNIQUE KEY `idgroup` (`idgroup`),
KEY `status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
wc_matches表
CREATE TABLE IF NOT EXISTS `wc_matches` (
`id` int(4) unsigned NOT NULL AUTO_INCREMENT,
`time` date NOT NULL,
`group_id` int(2) unsigned NOT NULL,
`place` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`team_id_1` int(10) unsigned NOT NULL,
`team_id_2` int(10) unsigned NOT NULL,
`edituser` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
KEY `group_id_foreign` (`group_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;
wc_teams表
CREATE TABLE IF NOT EXISTS `wc_teams` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`title` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`group_id` int(2) unsigned NOT NULL,
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;
ALTER TABLE `wc_teams`
ADD CONSTRAINT `group_id_foreign` FOREIGN KEY (`group_id`) REFERENCES `wc_groups` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;
为什么我在执行代码时遇到错误代码创建表wc_team
?
什么是可能的使用什么是可能的使用一个参考字段(wc_groups
(id
))对多个外键约束?
我想美这样 结构** wc_matches.group_id-> wc_groups.id wc_teams.group_id-> wc_groups.id ** – user3395037