I have 3 tables in mysql, One is a Company table, the other is a license table and the last is a joining table between both primary keys, When a person adds a company id to the license id in the joining table, it allows multiple companies to exist for one license, this cannot happen, so I need to do something that will only allow one company id for one license id
heres the tables
Table license
CREATE TABLE `License` (
`license_id` int(11) NOT NULL AUTO_INCREMENT,
`license_number` varchar(45) NOT NULL,
`start_date` date NOT NULL,
`end_date` date NOT NULL,
`duration` int(11) NOT NULL,
`expiry_date` date NOT NULL,
`product_id` int(11) DEFAULT NULL,
PRIMARY KEY (`license_id`)
) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=latin1;
;
Company Table
CREATE TABLE `Company` (
`company_id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`physical_address` varchar(255) DEFAULT NULL,
`postal_address` varchar(255) DEFAULT NULL,
`reseller_id` int(11) DEFAULT NULL,
PRIMARY KEY (`company_id`)
) ENGINE=InnoDB AUTO_INCREMENT=18 DEFAULT CHARSET=latin1;
and Joining table
CREATE TABLE `CompanyLicense` (
`license_id` int(11) NOT NULL,
`company_id` int(11) NOT NULL,
PRIMARY KEY (`license_id`,`company_id`),
KEY `companlicence_company_fk_idx` (`company_id`),
CONSTRAINT `companylicense_company_fk` FOREIGN KEY (`company_id`) REFERENCES `Company` (`company_id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `companylicense_license_fk` FOREIGN KEY (`license_id`) REFERENCES `License` (`license_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
So far i have this
INSERT INTO CompanyLicense (license_id, company_id) VALUES
('2','6') on duplicate key update license_id = '2';
doesnt seem to do the job
You need to make company unique in companylicense:
ALTER TABLE companylicense ADD UNIQUE KEY (company)
or better yet, make company a field in license instead of having a link table.
Related
I am working on a student attendance mini-project, and I don't know how to proceed for my database. I'm new to SQL and databases in general so this might seem dumb to you.
So, I want to do a database containing the table student, which contains : student_id (primary key) , name (string) and attendance(boolean) (that's the bare minimum, i'll add more afterwards) and I want to register the daily attendance of the students. So I want to have all the students tied to every date of the week.
I created a date table in phpMyadmin but I don't know how to proceed to link them, i've tried an Inner Join and it was successful.
The problem is : If i want to add another line to the student table my table won't update, so is there a way to "automatically" tie all the students to the date table ?
Sorry if this seems confused I've tried my best to summarize it !
Lets have some idea about tables should be there to implement a proper Student Attendance system in place. I have copied create script for some of my tables that used for maintaining Students record per course. I hope following sample Table scripts with relation will help you understanding regarding table structure and also to solve your issue.
Please be noted, That this table structures for your your reference only. You can add/remove tables/columns as per your requirement once you get an overall idea from this post.
CREATE TABLE `staff` (
`id` int(11) NOT NULL,
`type` varchar(200) DEFAULT NULL,
`first_name` varchar(200) DEFAULT NULL,
`last_name` varchar(200) DEFAULT NULL,
`emal` varchar(200) DEFAULT NULL,
`contact` varchar(200) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `batch` (
`id` int(11) NOT NULL,
`department` varchar(200) DEFAULT NULL,
`details` varchar(200) DEFAULT NULL,
`staff_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `batch_staff_idx` (`staff_id`),
CONSTRAINT `batch_staff` FOREIGN KEY (`staff_id`) REFERENCES `staff` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `student` (
`id` int(11) NOT NULL,
`batch_id` int(11) DEFAULT NULL,
`first_name` varchar(200) DEFAULT NULL,
`last_name` varchar(200) DEFAULT NULL,
`email` varchar(200) DEFAULT NULL,
`contact` varchar(200) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `batch_student_idx` (`batch_id`),
CONSTRAINT `batch_student` FOREIGN KEY (`batch_id`) REFERENCES `batch` (`batch_id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `course` (
`id` int(11) NOT NULL,
`name` varchar(200) DEFAULT NULL,
`details` varchar(200) DEFAULT NULL,
`staff_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `course_staff_idx` (`staff_id`),
CONSTRAINT `course_staff` FOREIGN KEY (`staff_id`) REFERENCES `staff` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `attendence` (
`course_id` int(11) NOT NULL,
`student_id` int(11) DEFAULT NULL,
`class_date` date DEFAULT NULL,
KEY `att_course_idx` (`course_id`),
KEY `att_student_idx` (`student_id`),
CONSTRAINT `att_course` FOREIGN KEY (`course_id`) REFERENCES `course` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `att_student` FOREIGN KEY (`student_id`) REFERENCES `student` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Your required data will finally store into table Attendance. From this table data, you will be able to find list of students absent/present per date and per course. Remember, the attendance table should enrich daily from a automated OR a manual process.
I'm trying to build out a fairly simple temporary table. The table will end up being 2 columns:
1 A product ID
2 A string of concatenated compliance data in a format that can be consumed later
CREATE TEMPORARY TABLE products.compliances_data
(INDEX product_id_idx (product_id))
SELECT
products.product_id,
GROUP_CONCAT(JSON_OBJECT('compliance_code', cc.compliance_code, 'compliance_full_name', pc.full_name, 'compliance_web_description_short', pc.web_description_short) SEPARATOR ' - ') as compliances
FROM products.products products
LEFT OUTER JOIN products.material_compliance_map cc on products.material_id = cc.material_id
LEFT OUTER JOIN products.compliances pc on cc.compliance_id = pc.compliance_id
GROUP BY products.part_number
The table gathers and joins information from 3 tables.
The products table is the main source of information. The products table has a column for material_id.
The material_compiance_map table. This is a many-to-many table that maps material_id's to compliance_id's
The compliances table. This is the table where the actual data is stored that I need to pull from to build out the concatenated object.
The problem is the creation of the temporary table takes 3-4 minutes to run yet only yields about 1.2 million entries which seems incredibly slow.
Running an explain on the select portion of the query yields:
Explain on select image
There are only 642 entries in the material_comliance_map so there's not an awful lot of data here that needs to be traversed.
I've tried removing the group_concat and that seems to speed up the query about 33%. The problem seems to revolve around the group by statement.
How can I improve the speed when building this temp table?
EDIT:
Schemas:
material_compliance_map schema
'material_compliance_map'
CREATE TABLE `material_compliance_map` (
`material_id` int(11) NOT NULL,
`material_code` varchar(20) COLLATE utf8_unicode_ci NOT NULL,
`compliance_id` int(11) NOT NULL,
`compliance_code` varchar(20) COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`material_id`,`compliance_id`),
KEY `fk_compliance_id_material_compliances_compliances` (`compliance_id`),
KEY `fk_material_id_material_compliances_materials` (`material_id`),
CONSTRAINT `fk_compliance_id_material_compliances_compliances` FOREIGN KEY (`compliance_id`) REFERENCES `compliances` (`compliance_id`) ON UPDATE CASCADE,
CONSTRAINT `fk_material_id_material_compliances_materials` FOREIGN KEY (`material_id`) REFERENCES `materials` (`material_id`) ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci
compliances schema:
'compliances'
CREATE TABLE `compliances` (
`compliance_id` int(11) NOT NULL AUTO_INCREMENT,
`compliance_code` varchar(20) NOT NULL,
`full_name` varchar(155) DEFAULT NULL,
`web_description_short` varchar(45) DEFAULT NULL,
PRIMARY KEY (`compliance_id`),
UNIQUE KEY `compliance_id_UNIQUE` (`compliance_id`),
UNIQUE KEY `compliance_code_UNIQUE` (`compliance_code`)
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=latin1
products schema:
'products'
CREATE TABLE `products` (
`part_number` varchar(27) NOT NULL,
`material_code` varchar(30) DEFAULT NULL,
`material_id` int(11) DEFAULT NULL,
`size_code` varchar(15) DEFAULT NULL,
`size_id` int(11) DEFAULT NULL,
`erp_description_1` varchar(31) DEFAULT NULL,
`erp_description_2` varchar(31) DEFAULT NULL,
`search_description` varchar(250) DEFAULT NULL,
`weight_lbs` decimal(8,4) DEFAULT NULL,
`part_number_prefix` varchar(15) DEFAULT NULL,
`tight_tolerance` tinyint(4) DEFAULT NULL,
`product_id` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`product_id`),
UNIQUE KEY `part_number_UNIQUE` (`part_number`),
UNIQUE KEY `product_id_UNIQUE` (`product_id`),
KEY `fk_material_id_products_materials` (`material_id`),
KEY `fk_size_id_products_sizes` (`size_id`),
KEY `product_id` (`product_id`),
KEY `size_id_idx` (`size_id`),
KEY `size_id_productsidx` (`size_id`),
KEY `material_id_idx` (`material_id`),
CONSTRAINT `fk_material_id_products_materials` FOREIGN KEY (`material_id`) REFERENCES `materials` (`material_id`),
CONSTRAINT `fk_size_id_products_sizes` FOREIGN KEY (`size_id`) REFERENCES `sizes` (`size_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1140987 DEFAULT CHARSET=latin1
I'm quite new to SQL, and I'm trying to upload data to my tables. For this I have special tables where I upload the data from a CSV file, and then, from this table, I am trying to copy the data to the final table.
But now I have a problem with an intermediate table where I have uploaded my data. The table is:
CREATE TABLE `_work_has_person` (
`work_id` int(11) NOT NULL,
`person_id` int(11) NOT NULL,
`primary_contribution_id` int(11) DEFAULT NULL,
PRIMARY KEY (`work_id`,`person_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
I want to copy the data in
CREATE TABLE `work_has_person` (
`work_id` int(11) NOT NULL,
`person_id` int(11) NOT NULL,
`primary_contribution_id` int(11) NOT NULL,
PRIMARY KEY (`work_id`,`person_id`),
KEY `fk_work_has_person_person1_idx` (`person_id`),
KEY `fk_work_has_person_work1_idx` (`work_id`),
KEY `fk_work_has_person_primary_contribution1_idx` (`primary_contribution_id`),
CONSTRAINT `fk_work_has_person_person1` FOREIGN KEY (`person_id`) REFERENCES `person` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_work_has_person_primary_contribution1` FOREIGN KEY (`primary_contribution_id`) REFERENCES `primary_contribution` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_work_has_person_work1` FOREIGN KEY (`work_id`) REFERENCES `work` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Which is an intermediate table between:
CREATE TABLE `work` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title_work` varchar(250) DEFAULT NULL,
`subtitle_work` varchar(250) DEFAULT NULL,
`date_work` varchar(45) DEFAULT NULL,
`unix_date_work` varchar(100) DEFAULT NULL,
`sinopsis` text,
`ref_bne` varchar(100) DEFAULT NULL,
`ref_alt` longtext,
`language_id` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `fk_work_language1_idx` (`language_id`),
KEY `title_work` (`title_work`),
CONSTRAINT `fk_work_language1` FOREIGN KEY (`language_id`) REFERENCES `language` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=24610 DEFAULT CHARSET=utf8;
and
CREATE TABLE `person` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) NOT NULL,
`img_person` varchar(250) DEFAULT NULL,
`born_date` varchar(45) DEFAULT NULL,
`unix_born_date` varchar(100) DEFAULT NULL,
`city_born_date` varchar(100) DEFAULT NULL,
`country_born_date` varchar(100) DEFAULT NULL,
`death_date` varchar(45) DEFAULT NULL,
`unix_death_date` varchar(100) DEFAULT NULL,
`city_death_date` varchar(100) DEFAULT NULL,
`country_death_date` varchar(45) DEFAULT NULL,
`biography` longtext,
`ref_bne` varchar(100) DEFAULT NULL,
`ref_alt` longtext,
PRIMARY KEY (`id`),
UNIQUE KEY `name_UNIQUE` (`name`),
KEY `name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=9159 DEFAULT CHARSET=utf8;
But everytime I try to run
INSERT INTO work_has_person (work_id, person_id, primary_contribution_id)
SELECT work_id, person_id, primary_contribution_id
FROM _work_has_person;
It says
Cannot add or update a child row: a foreign key constraint fails (`cdu93hfg93r`.
`work_has_person`, CONSTRAINT `fk_work_has_person_person1` FOREIGN KEY (`person_id`)
REFERENCES `person` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION)
I am pretty sure that the tables has the neccesary data, but, ¿is there a way to know which data fails? I have seen Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails: but don't understand exactly how to use it here.
A.
It is relatively easy to find out what data is causing the conflict: get all person_ids from _work_has_person that are not in the persons table. You can achieve this via an outer join and filtering for person.id is null in the where clause.
select * from `_work_has_person` whp
left join person p on whp.person_id=p.id
where p.id is null
You can actually remove such data from the results being inserted by including the reverse criterion into the select part of your insert query (an inner join):
INSERT INTO work_has_person (work_id, person_id, primary_contribution_id)
SELECT whp.work_id, whp.person_id, whp.primary_contribution_id
FROM _work_has_person whp
INNER join person p on whp.person_id=p.id
I am trying to make an e-commerce site from scratch. Currently I am trying to make the database.
These are the core tables that the database will have:
Customer: which will have email, username, password....
Customers_Session: Stores information about customer session in hash
Group: basically tells what permissions a customer will have
Category: the category type of a product
Product: information about a product such as name, and description...
Product_Price: Price info on products. This will store the different prices put for each product at various times.
Product_Variation: information about product images, and various colors or styles of a product.
Customer_Orders: What products a customer has ordered.
Customer_Reviews: Reviews made by customers on a product.
Reviewed Products: This table is created based on many to many relationship between the Product table and the Review Table.
Ordered products: This table is created based on the many to many relationship between the Product and the Orders Table.
Based on the above, I have come up with the sql code below:
--
-- Table structure for table `users`
--
CREATE TABLE IF NOT EXISTS `users` (
`id` int(11) NOT NULL AUTO_INCREMENT ,
`username` varchar(30) NOT NULL,
`password` varchar(64) NOT NULL,
`first_name` varchar(50) NOT NULL,
`last_name` varchar(50) NOT NULL,
`email` varchar(50) NOT NULL,
`address` varchar(320) NOT NULL,
`zip` mediumint(5) NOT NULL,
`salt` varchar(40) NOT NULL,
`joined` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`group` tinyint(1) NOT NULL,
`dob` date NOT NULL,
`pic_url` varchar(225) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
--
--
-- Table structure for table `groups`
--
CREATE TABLE IF NOT EXISTS `groups` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(20) NOT NULL,
`permissions` text NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
--
-- This is for category table
--
CREATE TABLE IF NOT EXISTS `category`(
`category_id` tinyint(3) NOT NULL AUTO_INCREMENT,
`category_type` varchar(100) NOT NULL,
`category_description` varchar(160) NOT NULL,
PRIMARY KEY (`category_id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
--
--
-- This is for product table
--
CREATE TABLE IF NOT EXISTS `products`(
`product_id` int(11) NOT NULL AUTO_INCREMENT,
`product_name` varchar(100) NOT NULL UNIQUE,
`product_description` varchar(160) NOT NULL,
`quantity` int(5) NOT NULL,
`product_code` varchar(4) NOT NULL,
`keywords` varchar(70) NOT NULL,
`category_id` tinyint(3),
PRIMARY KEY (`product_id`),
INDEX (`category_id`),
CONSTRAINT FOREIGN KEY (`category_id`) REFERENCES category(`category_id`) ON DELETE SET NULL
)ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
--
--
--
-- Table structure for table `bookings`
--
CREATE TABLE IF NOT EXISTS `bookings` (
`bookings_id` int(11) NOT NULL AUTO_INCREMENT,
`party_type` varchar(50) NOT NULL,
`location` varchar(100) NOT NULL,
`day` varchar(10) NOT NULL,
`time` smallint(6) NOT NULL,
`people_count` smallint(6) NOT NULL,
`booking_name` varchar(50) NOT NULL,
`booking_email` varchar(50) NOT NULL,
PRIMARY KEY (`bookings_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='This is for the bookings' AUTO_INCREMENT=1 ;
--
-- Dumping data for table `groups`
--
INSERT INTO `groups` (`id`, `name`, `permissions`) VALUES
(1, 'Administrator', '{"admin":1}'),
(2, 'Users', '{"users":2}');
--
-- Table Structure for Reviews
--
CREATE TABLE IF NOT EXISTS `customer_reviews`(
`reviews_id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11),
`rating` int(5) NOT NULL,
`comment` varchar(160) NOT NULL,
PRIMARY KEY(`reviews_id`),
INDEX (`user_id`),
CONSTRAINT FOREIGN KEY(`user_id`) REFERENCES users(`user_id`) ON DELETE SET NULL
)ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
--
--
-- Table structure for reviewed products This is a many relationshi btw reviews table and product
--
CREATE TABLE IF NOT EXISTS `reviewed_products`(
`product_id` int(11),
`reviews_id`int(11),
PRIMARY KEY(`product_id`,`reviews_id`),
CONSTRAINT FOREIGN KEY(`product_id`) REFERENCES products(`product_id`) ON DELETE SET NULL,
CONSTRAINT FOREIGN KEY(`reviews_id`) REFERENCES customer_reviews(`reviews_id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='This is for many to many cardinality btw reviews and products' AUTO_INCREMENT=1 ;
--
--
-- Table structure for table `orders`
--
CREATE TABLE IF NOT EXISTS `customer_orders` (
`order_id` int(11) NOT NULL AUTO_INCREMENT,
`order_time` int(11) NOT NULL,
`amount` int(5),
`confirmation_number` int(,
`user_id` int(11),
`product_id` int(11),
PRIMARY KEY (`order_id`),
INDEX (`user_id`),
CONSTRAINT FOREIGN KEY (`user_id`) REFERENCES users(`user_id`) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
/* We need a new table since the customer_order and product is in a many to many relationship */
--
--
-- Table structure for table `curtomer_order_product`
--
CREATE TABLE IF NOT EXISTS `ordered_product`(
`product_id` int(11),
`order_id` int(11),
`quantity` smallint(5),
PRIMARY KEY(`product_id`,`order_id`),
INDEX (`product_id`,`order_id`),
CONSTRAINT FOREIGN KEY (`order_id`) REFERENCES customer_orders(`order_id`) ON DELETE RESTRICT,
CONSTRAINT FOREIGN KEY (`product_id`) REFERENCES products(`product_id`) ON DELETE RESTRICT
)ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
--
-- This is for price table
--
CREATE TABLE IF NOT EXISTS `product_price`(
`price_id` int(11) NOT NULL AUTO_INCREMENT,
`price` decimal(6,2) NOT NULL,
`product_id` int(11) NOT NULL,
PRIMARY KEY (`price_id`),
INDEX (`product_id`),
CONSTRAINT FOREIGN KEY (`product_id`) REFERENCES products(`product_id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
--
--
-- Table structure for table `product_variations`
--
CREATE TABLE IF NOT EXISTS `product_variations`(
`variations_id` int(11) NOT NULL AUTO_INCREMENT,
`color_name` varchar(10) NOT NULL,
`color_value` char(6) NOT NULL,
`product_id` int(11),
`picture1` varchar(100) NOT NULL,
`picture2` varchar(100) NOT NULL,
`picture3` varchar(100) NOT NULL,
PRIMARY KEY (`variations_id`),
INDEX (`product_id`),
CONSTRAINT FOREIGN KEY (`product_id`) REFERENCES products(`product_id`) ON DELETE RESTRICT
)ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
--
--
-- Table structure for table `users_session`
--
CREATE TABLE IF NOT EXISTS `users_session` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`hash` varchar(64) NOT NULL,
PRIMARY KEY (`id`),
INDEX (`user_id`),
CONSTRAINT FOREIGN KEY(`user_id`) REFERENCES users(`user_id`) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
The problem is that when I try to run the above code in PHPmyadmin, I get an error stating "Cannot add foreign key constraint". This starts to happen when creating the customer_Reviews table and any other subsequent tables that require foreign keys.
My questions are:
1. Would you recommend designing the database this way.
2. Why am I getting the "Cannot add foreign key constraint" error?
Thanks.
For a full quality review of your database design, you might try the Code Review sister site. At a glance, I don't see any glaring issues with your database design or your SQL.
The foreign key constraint is failing because you have misnamed the column in question.
CONSTRAINT FOREIGN KEY(`user_id`) REFERENCES users(`user_id`)
should be:
CONSTRAINT FOREIGN KEY(`user_id`) REFERENCES users(`id`)
I have two related tables: Groups and Clients. Clients belongs to Groups so I have a foreign key "group_id" that references the group a client belongs to.
I'm changing the Group id from an autoincrement to a UUID. So what I need is to generate a UUID for each Group and update the Clients table at once to reflect the changes and keep the records related.
Is there a way to do this with multiple-table update on MySQL?
Adding tables definitions for clarification.
CREATE TABLE `groups` (
`id` char(36) NOT NULL,
`name` varchar(255) DEFAULT NULL,
`created` datetime DEFAULT NULL,
`modified` datetime DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8$$
CREATE TABLE `clients` (
`id` char(36) NOT NULL,
`name` varchar(255) NOT NULL,
`group_id` char(36) DEFAULT NULL,
`active` tinyint(1) DEFAULT '1'
PRIMARY KEY (`id`),
KEY `fkgp` (`group_id`),
CONSTRAINT `fkgp` FOREIGN KEY (`group_id`) REFERENCES `groups` (`id`)
ON DELETE NO ACTION ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8$$