Category "foreign-keys"

Hibernate : functionnally calling hibernate to recreate constraints

I have been deferring my hibernate DDL usage time after time, from create-drop, to update and now i'm using other tools for database migration, and, while still

Error executing DDL "alter table add constraint foreign key () references (id)" via JDBC Statement

Error executing DDL "alter table child add constraint foreign key (parent_id) references (id)" via JDBC Statement caused by Failed to add the foreign key c

Update column "total price" in orders table using other columns (pizza_price*pizza_amount) in different tables?

This is relational diagram of database I created: I need to insert total price in Orders.Total_Price column by multiplying the Pizza.Pizza_Price value with Ord

How to restrict a Django model to a single one-to-one relation?

I am currently building a Django app that requires two different user types and I know that storing authentication information across multiple models/tables is

How to put a foreign key in knex migration?

I'm trying to put a foreign key in knex migration. "age_group_id"(primary key of the "agegroups" table) is the foreign key of the "users" table. So, I have put

C# EFCore.BulkExtensions The MERGE statement conflicted with the FOREIGN KEY constraint

Parent: public class Currency { [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public string? Name { get; set; }

Rails ActiveRecord migration to add foreign key with 'NOT VALID' parameter

Can add_foreign_key add a 'NOT VALID' parameter to the ALTER TABLE command? (Postgres, if it mattters) I have a foreign key between two very large tables. I ne

How to make a foreign key not using primary key

I have a migration on Laravel for table pasien like this : public function up() { Schema::create('pasien', function (Blueprint $table) { $table->

Django: Non-primary Foreign Key object can't access related model instance

I'm new in Django. I have 2 class tech_system adn equiptment in models.py class tech_system(models.Model): id_tech_system = models.BigAutoField(db_column='I

laravel migration best way to add foreign key

Simple question: I'm new to Laravel. I have this migration file: Schema::create('lists', function(Blueprint $table) { $table->increments('id'); $ta

Foreignkey relationship returning an AttributeError when queried in Django

Hy please am new to Django,I have a childmodel(relationship) referencing a parent model(Profile) through a foreign key. I want to get the relationship status of

Default value for foreign key in Django migrations.AddField

Using migrations, I need to add a new field (a foreign key) to a model. I know it can be done with: migrations.AddField( model_name='MyModel',

Django 2.0: sqlite IntegrityError: FOREIGN KEY constraint failed

I'm working on adding Django 2.0 support to the django-pagetree library. During automated testing, using an sqlite in-memory database, I'm getting a bunch of er

Two foreign keys reference one table - ON UPDATE SET NULL doesn't work

I've got two foreign keys in a table. Let's assume that table is called News and has foreign keys updatedById and createdById, both of which point to userId in

Error Code: 1822. Failed to add the foreign key constaint. Missing index for constraint

I found some threads about the error. But all the solutions doesn't work for me. I created 2 tables a user table and one for articles. Now I want to store the

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