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Foreign key reference in mysql innodb

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[数据库(mysql) 所属分类 数据库(mysql) | 发布者 店小二05 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏
problem with the foreign key reference in mysql

I have a table called mail with a foreign key column called deletedBy which references the users table by pk. when I create a new mail i want to set this field to null as the mail is undeleted, however when i do i get an foreign key constraint failur

Mysql errno 150 trying to create a table with foreign key references

I'm trying to create a table in mysql with a foreign key reference, like this: In database A: CREATE TABLE replication ( id varchar(255) NOT NULL PRIMARY KEY, uid varchar(255) NOT NULL, value int(11) NOT NULL, FOREIGN KEY (uid) REFERENCES databaseB.u

How to Find All Django Foreign Key References to an Instance

How do you find all direct foreign key references to a specific Django model instance? I want to delete a record, but I want to maintain all child records that refer to it, so I'm trying to "swap out" the reference to the old record with a diffe

Is there a simpler and faster way to drop a table that has foreign key references to other tables?

I have a new table that has foreign key references to a number of existing tables. When I create the new table for the first time, I created the foreign keys in the following way: ALTER TABLE [dbo].[NewTable] WITH CHECK ADD FOREIGN KEY([SectionDataba Foreign key reference to a table with a primary key containing 2 columns

Can you set a foreign key from a table to another one with a 2 column primary key in SQL referencing just one of the primary key columns Oracle?The foreign key must reference an entire primary key or other unique constraint. If the parent table requi

MS Access DDL: Show Foreign Key References in Relationship View

Using an ADODB connection object, I am able to use SQL DDL with MS Access (joy!). The odd thing is that sometimes declared foreign key references show up in Access' Relationship View - this would be great for visualization, and to print off to show s

Error Message with FOREIGN KEY REFERENCES

I am trying to create a table that will link to multiple roles. The table is called UserRoles and has only two columns. The first column contains a reference to a user The second column contains a link to a role I used FOREIGN KEY REFERENCES as you m

Use the values of a column (instead of numeric identifiers) as a foreign key reference

Was not sure how to express this in the title. So here's the deal: I have a table storing information about currency pairs used in foreign exchange rates: PAIR_ID | BASE_CURRENCY | TERM_CURRENCY | ATTRIBUTE1 | ATTRIBUTE2 ... Ideally I should have ano

MariaDB (MySQL?) Unable to create a foreign key - REFERENCES command denied

I'm on MariaDB trying to set a foreign key on a table called isotemp referencing another table, called ISO-3166-2-status. I had added references to all previous tables in the same database with the same user before, but this time Error Code: 1142. RE

SQL and FOREIGN KEY, REFERENCES

Hello i have a problem to create table. I would like to create table with refferences to "Model" CREATE TABLE Marka( id_marki INT PRIMARY KEY NOT NULL , nazwa VARCHAR(40) NOT NULL , id_modelu int FOREIGN KEY(id_modelu) REFERENCES Model(id_modelu

How to update the value of the foreign key in the mysql database

I have three tables: categories, languages and categories_languages. Categories_languages is many to many table which links together categories and languages. I would like to update a foregin key value in table languages but it throws me error #1451

What will be this foreign key on my MySQL database for me?

I am building a Project Management project withphp and MySQL. I have decided to add a Forum type Discussion sections. I am planning for it to be just like your typical Forums but instead of different Forum topic/sections, that will be replaced by a

Unable to create FOREIGN KEY CONSTRAINT in MySQL

I created my MySQL database using phpMyAdmin 3.5.8.1deb1 in Ubuntu. Instead of that all my tables are InnoDB, I can't add a foreign key, and this is an example: ALTER TABLE element ADD CONSTRAINT FK_element_id_user FOREIGN KEY (id_user) REFERENCES us

Adding a table with FOREIGN KEY to a MySQL database causes errno 150

I'm attemping to execute the following SQL and am receiving errno: 150 'cannot create table path_relations' in response. According to the MySQL documentation this is caused by my FOREIGN KEY restraints having issues. What am I doing wrong? DROP TABLE

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