I am trying to create a cross database foreign key. When I run the following code on the same database
CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`int_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `int_id` (`int_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ext_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
KEY `ext_id` (`ext_id`),
CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `t1` (`int_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
However, when create t1 on one databse (d1) and then run the following code on a second databse (d2), I receive the generic error: #1005 - Can't create table 'userdata.t2' (errno: 150)
CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ext_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
KEY `ext_id` (`ext_id`),
CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `d1.t1` (`int_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
Any help will be appreciated. Thanks!
Your syntax is not correct, try this
CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ext_id` varchar(128) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
KEY `ext_id` (`ext_id`),
CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `d1`.`t1` (`int_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
Related
Here I am doing foreign key relation for my SQL, I am having 3 tables
product
gallery
offer
Here product table is a master table and gallery, offer tables are child table, now I trying to delete the master table entry but it not happening I am getting an error like
Cannot delete or update a parent row: a foreign key constraint fails
CREATE TABLE `product` (
`productId` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) COLLATE utf16_bin NOT NULL,
`price` decimal(10,0) NOT NULL,
`regOn` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`productId`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf16 COLLATE=utf16_bin
CREATE TABLE `offer` (
`offerId` int(11) NOT NULL AUTO_INCREMENT,
`productId` int(11) NOT NULL,
`offerpercentage` text COLLATE utf16_bin NOT NULL,
PRIMARY KEY (`offerId`),
KEY `productId` (`productId`),
CONSTRAINT `offer_ibfk_1` FOREIGN KEY (`productId`) REFERENCES `product` (`productId`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf16 COLLATE=utf16_bin
CREATE TABLE `gallery` (
`galleryId` int(11) NOT NULL AUTO_INCREMENT,
`productId` int(11) NOT NULL,
`galleryName` text COLLATE utf16_bin NOT NULL,
PRIMARY KEY (`galleryId`),
KEY `productId` (`productId`),
CONSTRAINT `gallery_ibfk_1` FOREIGN KEY (`productId`) REFERENCES `product` (`productId`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf16 COLLATE=utf16_bin
Expected output
Suppose I am deleting master table entry means i have to delete all child tables entry also
You need to apply the ON DELETE CASCADE to your foreign key references.
CREATE TABLE `product` (
`productId` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) COLLATE utf16_bin NOT NULL,
`price` decimal(10,0) NOT NULL,
`regOn` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (`productId`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf16 COLLATE=utf16_bin
CREATE TABLE `offer` (
`offerId` int(11) NOT NULL AUTO_INCREMENT,
`productId` int(11) NOT NULL,
`offerpercentage` text COLLATE utf16_bin NOT NULL,
PRIMARY KEY (`offerId`),
KEY `productId` (`productId`),
CONSTRAINT `offer_ibfk_1` FOREIGN KEY (`productId`) REFERENCES `product` (`productId`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf16 COLLATE=utf16_bin
CREATE TABLE `gallery` (
`galleryId` int(11) NOT NULL AUTO_INCREMENT,
`productId` int(11) NOT NULL,
`galleryName` text COLLATE utf16_bin NOT NULL,
PRIMARY KEY (`galleryId`),
KEY `productId` (`productId`),
CONSTRAINT `gallery_ibfk_1` FOREIGN KEY (`productId`) REFERENCES `product` (`productId`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf16 COLLATE=utf16_bin
This tells MySQL that when the parent is deleted, delete the referencing child.
Hi i make a table from this tutorial MySQL Foreign Key On Delete and this work good for my project
user table :
CREATE TABLE `User` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`Name` varchar(255) DEFAULT NULL,
PRIMARY KEY (`Id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
UserStaff Table :
CREATE TABLE `UserStaff` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`UserId` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`Id`),
KEY `UserId` (`UserId`),
CONSTRAINT `UserStaff_ibfk_1`
FOREIGN KEY (`UserId`)
REFERENCES `User` (`Id`)
ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
my question is : whate is UserStaff_ibfk_1 ?
can i change it to example_name or not
thanks
I have 3 existed tables:"customer" "news" "hallplace",here is the code how I create them:
DROP TABLE IF EXISTS `customer`;
CREATE TABLE `customer` (
`id` varchar(32) COLLATE utf8_bin NOT NULL,
...
PRIMARY KEY (`id`),
...
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
DROP TABLE IF EXISTS `news`;
CREATE TABLE `news` (
`id` varchar(32) NOT NULL,
...
PRIMARY KEY (`id`),
...
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `hall_place`;
CREATE TABLE `hall_place` (
`id` varchar(32) NOT NULL,
...
PRIMARY KEY (`id`),
...
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
now i need to create a new table "customer_news":
CREATE TABLE `customer_news` (
`id` varchar(32) COLLATE utf8_bin NOT NULL,
..
`fk_customer_id` varchar(32) COLLATE utf8_bin DEFAULT NULL,
`fk_news_id` varchar(32) COLLATE utf8_bin DEFAULT NULL,
`fk_hallplace_id` varchar(32) COLLATE utf8_bin DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `FK8037FE9466E72C39` (`fk_customer_id`),
KEY `FK8037FE94B522885D` (`fk_news_id`),
KEY `FK8037FE94255BE4D0` (`fk_hallplace_id`),
CONSTRAINT `FK8037FE94255BE4D0` FOREIGN KEY (`fk_hallplace_id`) REFERENCES `hall_place` (`id`),
CONSTRAINT `FK8037FE9466E72C39` FOREIGN KEY (`fk_customer_id`) REFERENCES `customer` (`id`),
CONSTRAINT `FK8037FE94B522885D` FOREIGN KEY (`fk_news_id`) REFERENCES `news` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
it's work well on mysql version5.6,but on mysql 5.5,error shows:
[Err] 1005 - Can't create table 'hgwechat-ms.customer_news' (errno: 150)
^_^ this is my first time using stackworkflow,i dont konw how to format.
I suggest something is wrong with the foreign keys, but i can't find a hint.
error while importing the sql:
ALTER TABLE `claim`
ADD CONSTRAINT `FK_66A8F1231B7B246A` FOREIGN KEY (`purchaseOrder_id`) REFERENCES `PurchaseOrder` (`id`) ON DELETE CASCADE,
ADD CONSTRAINT `FK_66A8F1237294869C` FOREIGN KEY (`article_id`) REFERENCES `Article` (`id`);
#1005 - Can't create table 'databasename.#sql-5c7_568c0' (errno: 150)
I also checked the conditions of this answer MySQL Creating tables with Foreign Keys giving errno: 150
But i couldn't find the mistake.
Any guesses?
Tables:
CREATE TABLE `Article` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`number` int(11) NOT NULL,
`currency` tinyint(1) NOT NULL,
`price` double NOT NULL,
`tolerance` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-- --------------------------------------------------------
CREATE TABLE `claim` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`comment` longtext COLLATE utf8_unicode_ci NOT NULL,
`purchaseOrder_id` int(11) DEFAULT NULL,
`visible` tinyint(1) NOT NULL,
`article_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `IDX_66A8F1231B7B246A` (`purchaseOrder_id`),
KEY `IDX_66A8F1237294869C` (`article_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `purchaseorder` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`date` datetime NOT NULL,
`state` int(11) NOT NULL,
`supplier_id` int(11) DEFAULT NULL,
`delivery_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `IDX_AA004F112ADD6D8C` (`supplier_id`),
KEY `IDX_AA004F1112136921` (`delivery_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
Your table name is purchaseorder
--------------------------^-----------^
ALTER TABLE `claim`
ADD CONSTRAINT `FK_66A8F1231B7B246A` FOREIGN KEY (`purchaseOrder_id`) REFERENCES `purchaseorder` (`id`) ON DELETE CASCADE,
ADD CONSTRAINT `FK_66A8F1237294869C` FOREIGN KEY (`article_id`) REFERENCES `Article` (`id`);
I'm having a little trouble with some MySQL relationships. I think I'm missing something obvious in my structure. Here's my SQL:
DROP TABLE IF EXISTS `parentlist_comments`;
CREATE TABLE `parentlist_comments` (
`id` char(36) NOT NULL,
`parentlist_id` char(36) NOT NULL,
`user_id` char(36) NOT NULL,
`comment` char(50) NOT NULL,
`accepted` tinyint(1) NOT NULL DEFAULT '0',
`submitted` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`),
KEY `fk_parentlist_comments_parentlist` (`parentlist_id`),
KEY `fk_parentlist_comment_user` (`user_id`),
CONSTRAINT `fk_parentlist_comments_parentlist` FOREIGN KEY (`parentlist_id`) REFERENCES `parentlists` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_parentlist_comment_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `parentlist_submissions`;
CREATE TABLE `parentlist_submissions` (
`id` char(36) NOT NULL,
`parentlist_id` char(36) NOT NULL,
`type_id` char(36) NOT NULL,
`name` char(25) NOT NULL,
`user_id` char(36) NOT NULL,
`accepted` tinyint(1) NOT NULL DEFAULT '0',
`submitted` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`votes` int(3) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `fk_parentlist_submissions_user` (`user_id`),
KEY `fk_parentlist_submissions_list` (`parentlist_id`),
KEY `fk_parentlist_submissions_type` (`type_id`),
CONSTRAINT `fk_parentlist_submissions_list` FOREIGN KEY (`parentlist_id`) REFERENCES `parentlists` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_parentlist_submissions_type` FOREIGN KEY (`type_id`) REFERENCES `types` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_parentlist_submissions_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `parentlists`;
CREATE TABLE `parentlists` (
`id` char(36) NOT NULL,
`name` char(20) NOT NULL,
`description` char(50) NOT NULL,
`user_id` char(36) NOT NULL,
`max_comments` int(3) NOT NULL DEFAULT '0',
`max_submissions` int(3) NOT NULL DEFAULT '10',
`max_votes` int(3) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `fk_list_user` (`user_id`),
CONSTRAINT `fk_list_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=FIXED;
DROP TABLE IF EXISTS `submissions`;
CREATE TABLE `submissions` (
`id` char(36) NOT NULL,
`type_id` char(36) NOT NULL,
`name` char(30) NOT NULL,
`description` char(50) NOT NULL,
`embed` char(200) DEFAULT NULL,
`user_id` char(36) NOT NULL,
`accepted` tinyint(1) NOT NULL DEFAULT '0',
`submitted` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
`votes` int(5) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `fk_submission_user` (`user_id`),
KEY `fk_submission_type` (`type_id`),
CONSTRAINT `fk_submission_type` FOREIGN KEY (`type_id`) REFERENCES `types` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_submission_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `types`;
CREATE TABLE `types` (
`id` char(36) NOT NULL,
`name` char(20) NOT NULL,
`description` char(20) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
`id` char(36) NOT NULL,
`name` char(20) NOT NULL,
`password` char(20) NOT NULL,
`email` char(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
I created an column called submission_id in parentlist_submissions. I'm trying to create a foreign key relationship between parentlist_submissions.submission_id and submissions.id, when I attempt to do this I get the error: Foriegn key constraint fails. For whatever reason my query browser won't let me copy this.
Any help here is greatly appreciated!
That error is usually caused by the tables already being populated with data that violate the constraint. (Note that nulls may be a problem if you've just added the column.)
I'm guessing, because I don't see that you've posted the statement where you create the submission_index column or where you create the foreign key constraint.
You seem to be missing the "parentlist_submissions.submission_id" column.