Category "foreign-keys"

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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