MySQL - ここで外部キーを追加できないのはなぜですか？

Question

なぜ特定の外部キーをここに追加できないのか分かりません。これらのテーブルは、MySQL Workbenchを介して生成され、MySQLのドキュメントと他の類似の問題や解決策を検索すると、はと思っていますが、特に私は1つの外部キーを追加できません：

inspection_statuses。 inspection_idはinspection_responsesを参照する必要があります。 tpa_result

私は見逃していますか？

これは私が新しい外部キーを追加するために使用しようとしている文です：

ALTER TABLE `vipsouth_app`.`inspection_statuses` 
ADD CONSTRAINT `inspection_statuses_ibfk_3` 
    FOREIGN KEY (`inspection_id`) 
    REFERENCES `vipsouth_app`.`inspection_responses` (`tpa_result`) 
    ON DELETE NO ACTION 
    ON UPDATE NO ACTION; 

をそして、それは、このエラーを生成します。

操作に失敗しました：SQLスクリプトを適用中にエラーが発生しましたデータベースに転送します。 エラー1005：テーブルvipsouth_appを作成できません。 #sql-1f48_7（エラー番号：150 "外部キー制約が間違って形成されている"）

CREATE TABLE `inspection_responses` (
    `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 
    `inspection_request_id` int(10) unsigned NOT NULL, 
    `tpa_result` varchar(10) CHARACTER SET utf8 NOT NULL, 
    `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
    `created_by` int(10) unsigned NOT NULL DEFAULT '0', 
    `updated_at` timestamp NULL DEFAULT NULL, 
    `updated_by` int(10) unsigned DEFAULT NULL, 
    `deleted_at` timestamp NULL DEFAULT NULL, 
    `deleted_by` int(10) unsigned DEFAULT NULL, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `id_UNIQUE` (`id`), 
    UNIQUE KEY `tpa_result_UNIQUE` (`tpa_result`), 
    KEY `inspection_responses_ibfk_1_idx` (`inspection_request_id`), 
    CONSTRAINT `inspection_responses_ibfk_1` FOREIGN KEY (`inspection_request_id`) REFERENCES `inspection_requests` (`id`) ON DELETE  CASCADE ON UPDATE CASCADE 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci 

CREATE TABLE `inspection_statuses` (
    `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 
    `inspection_request_id` int(10) unsigned NOT NULL, 
    `inspection_response_id` int(10) unsigned NOT NULL, 
    `tpa_code` varchar(4) COLLATE utf8_unicode_ci NOT NULL, 
    `user_id` varchar(30) COLLATE utf8_unicode_ci NOT NULL, 
    `password` varchar(100) COLLATE utf8_unicode_ci NOT NULL, 
    `inspection_id` varchar(10) COLLATE utf8_unicode_ci NOT NULL, 
    `status` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL, 
    `note` varchar(1000) COLLATE utf8_unicode_ci DEFAULT NULL, 
    `url` varchar(1024) COLLATE utf8_unicode_ci DEFAULT NULL, 
    `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
    `created_by` int(10) unsigned NOT NULL, 
    `updated_at` timestamp NULL DEFAULT NULL, 
    `updated_by` int(10) unsigned DEFAULT NULL, 
    `deleted_at` timestamp NULL DEFAULT NULL, 
    `deleted_by` int(10) unsigned DEFAULT NULL, 
    PRIMARY KEY (`id`), 
    UNIQUE KEY `id_UNIQUE` (`id`), 
    KEY `inspection_statuses_ibfk_1_idx` (`inspection_request_id`), 
    KEY `inspection_statuses_ibfk_2_idx` (`inspection_response_id`), 
    CONSTRAINT `inspection_statuses_ibfk_1` FOREIGN KEY (`inspection_request_id`) REFERENCES `inspection_requests` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, 
    CONSTRAINT `inspection_statuses_ibfk_2` FOREIGN KEY (`inspection_response_id`) REFERENCES `inspection_responses` (`id`) ON DELETE CASCADE ON UPDATE CASCADE 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci 

Answer 1

The data types and constraints defined on both the columns should be exactly the same. Except for a foreign key can be NULLable.

これはあなたのためにそれを行う必要があります。私は何の誤りもなかった。

SET foreign_key_checks = 0; 

    CREATE TABLE `inspection_responses` (
     `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 
     `inspection_request_id` int(10) unsigned NOT NULL, 
     `tpa_result` varchar(10) CHARACTER SET utf8 NOT NULL, 
     `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
     `created_by` int(10) unsigned NOT NULL DEFAULT '0', 
     `updated_at` timestamp NULL DEFAULT NULL, 
     `updated_by` int(10) unsigned DEFAULT NULL, 
     `deleted_at` timestamp NULL DEFAULT NULL, 
     `deleted_by` int(10) unsigned DEFAULT NULL, 
     PRIMARY KEY (`id`), 
     UNIQUE KEY `id_UNIQUE` (`id`), 
     UNIQUE KEY `tpa_result_UNIQUE` (`tpa_result`), 
     KEY `inspection_responses_ibfk_1_idx` (`inspection_request_id`), 
     CONSTRAINT `inspection_responses_ibfk_1` FOREIGN KEY (`inspection_request_id`) REFERENCES `inspection_requests` (`id`) ON DELETE  CASCADE ON UPDATE CASCADE 
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; 

    CREATE TABLE `inspection_statuses` (
     `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 
     `inspection_request_id` int(10) unsigned NOT NULL, 
     `inspection_response_id` int(10) unsigned NOT NULL, 
     `tpa_code` varchar(4) COLLATE utf8_unicode_ci NOT NULL, 
     `user_id` varchar(30) COLLATE utf8_unicode_ci NOT NULL, 
     `password` varchar(100) COLLATE utf8_unicode_ci NOT NULL, 
     `inspection_id` varchar(10) COLLATE utf8_unicode_ci NOT NULL, 
     `status` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL, 
     `note` varchar(1000) COLLATE utf8_unicode_ci DEFAULT NULL, 
     `url` varchar(1024) COLLATE utf8_unicode_ci DEFAULT NULL, 
     `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
     `created_by` int(10) unsigned NOT NULL, 
     `updated_at` timestamp NULL DEFAULT NULL, 
     `updated_by` int(10) unsigned DEFAULT NULL, 
     `deleted_at` timestamp NULL DEFAULT NULL, 
     `deleted_by` int(10) unsigned DEFAULT NULL, 
     PRIMARY KEY (`id`), 
     UNIQUE KEY `id_UNIQUE` (`id`), 
     KEY `inspection_statuses_ibfk_1_idx` (`inspection_request_id`), 
     KEY `inspection_statuses_ibfk_2_idx` (`inspection_response_id`), 
     CONSTRAINT `inspection_statuses_ibfk_1` FOREIGN KEY (`inspection_request_id`) REFERENCES `inspection_requests` (`id`) ON DELETE CASCADE ON UPDATE CASCADE, 
     CONSTRAINT `inspection_statuses_ibfk_2` FOREIGN KEY (`inspection_response_id`) REFERENCES `inspection_responses` (`id`) ON DELETE CASCADE ON UPDATE CASCADE 
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; 

SET foreign_key_checks = 1;