我有一个表消息。我尝试使用 message_id 外键创建表 contests 。
CREATE TABLE IF NOT EXISTS `message` (
`chat_id` bigint COMMENT 'Unique chat identifier',
`id` bigint UNSIGNED COMMENT 'Unique message identifier',
....
PRIMARY KEY (`chat_id`, `id`),
...
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_520_ci;
还有我的 table 比赛
CREATE TABLE IF NOT EXISTS `contests` (
`id` INT(11) AUTO_INCREMENT COMMENT 'ID записи',
...
`message_id` bigint UNSIGNED COMMENT 'ID сообщения с кнопкой',
`chat_id` bigint COMMENT 'Так надо',
...
PRIMARY KEY (`id`),
FOREIGN KEY (`message_id`) REFERENCES `message` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (`chat_id`) REFERENCES `message` (`chat_id`) ON DELETE CASCADE ON UPDATE CASCADE,
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_520_ci;
Error: Create table 'admin_bot/contests' with foreign key constraint failed. There is no index in the referenced table where the referenced columns appear as the first columns.
最佳答案
您需要使用表的主键在表的外键中引用它。您的 SQL 需要如下所示:
CREATE TABLE IF NOT EXISTS `contests` (
`id` INT(11) AUTO_INCREMENT COMMENT 'ID записи',
...
`message_id` bigint UNSIGNED COMMENT 'ID сообщения с кнопкой',
`chat_id` bigint COMMENT 'Так надо',
...
PRIMARY KEY (`id`),
FOREIGN KEY (`chat_id`, `message_id`) REFERENCES `message` (`chat_id`, `id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_520_ci;
关于php - 在我的表中创建 message_id 时出现 MySQL 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49927649/