foreign-key-relationship Questions
3
Solved
I have a model A which contains a generic foreign key relation with limit choices to 3 other models(consider them as B, C and D) in the same app. And I know the limitations of generic foreign keys ...
Underestimate asked 15/1, 2013 at 8:7
2
Solved
I have 10 tables in my database(MySQL). two of them is given below
tbl_state
state_id |int(10) |UNSIGNED ZEROFILL auto_increment
state_name |varchar(40)
tbl_city
city_id |int(10) |UNSIGNED...
Spoonful asked 24/3, 2010 at 13:7
2
Solved
It seems the situation is simply (but it does not work).
Db part (EVENT_ID is foreign key. FK_RR_E_CI constraint references on EVENT table)
|-------| |----------------|
| EVENT | 1 ------ ∞ | RE...
Twentyfourmo asked 5/7, 2017 at 21:43
5
Solved
This question is pretty much similar to this one, but for SQL Server 2005 :
I have 2 tables in my database:
--'#' denotes the primary key
[Libraries]
#ID #Application Name
1 MyApp Title 1
2 MyA...
Protractor asked 5/7, 2010 at 10:21
2
Solved
I have information about music albums that I want to organise in RDBMS tables with relations between them. I have the following info for each album: artist, album name, year, label, genre, style, r...
Silverstein asked 15/3, 2017 at 21:52
5
Solved
I would like to drop the foreign key in my table but been into this error message
mysql> alter table customers drop foreign key customerid;
ERROR 1025 (HY000): Error on rename of '.\products\cu...
Pilliwinks asked 17/5, 2012 at 8:57
1
I've got two models:
class Company(models.Model):
...
class Supplier(models.Model):
company = models.ForeignKey(Company, null=True, related_name="suppliers")
How to get all Companies with the...
Sacco asked 18/11, 2016 at 0:20
1
Solved
I am trying to store a list of models within the field of another model. Here is a trivial example below, where I have an existing model, Actor, and I want to create a new model, Movie, with the fi...
Aperiodic asked 18/10, 2016 at 9:29
2
I just added a table "PackageItems" to an existing SQL Server 2008 R2 database. I'm working in SQL Server Management Studio. After creating the new table I created a relationship between that table...
Suspect asked 20/2, 2011 at 17:2
3
Solved
public class Foo
{
public string FooId{get;set;}
public Boo Boo{get;set;}
}
public class Boo
{
public string BooId{get;set;}
public Foo Foo{get;set;}
}
I was trying to do this in Entity Fra...
Kanchenjunga asked 30/6, 2011 at 7:57
3
Solved
I'm serialzing a Product model and its comments. Here's my simple code:
class ProductSerializer(serializers.HyperlinkedModelSerializer):
comment_set = CommentSerializer(many=True, read_only=True)...
Upstanding asked 10/7, 2016 at 6:39
4
Solved
There is a table t which has inherited children. I want that only the children can receive inserts. What is the best way to force that the parent table rejects inserts?
create table t (c int);
crea...
Anaplasty asked 3/3, 2012 at 11:32
3
Solved
Let's suppose that we have this situation:
Tables in database:
Country (id, country_name), Person (id, login), CountryManager (id_country, id_person), CountryStakeholder (id_country, id_person)
...
Honeymoon asked 5/11, 2014 at 13:0
3
Solved
Hi,
Can you help me how to disable creating nested objects ?
I have serializers like this:
(Employee has ForeignKey to Team)
class TeamSerializer(serializers.ModelSerializer):
class Meta:
mod...
Kaiserism asked 1/8, 2014 at 20:50
3
I seem to be having trouble setting up a Foreign Key between two of my tables.
Here is the CREATE clause for each table:
CREATE TABLE IF NOT EXISTS `dbname`.`CallRecord` (
`id` INT NOT NULL AUTO...
Briannebriano asked 11/2, 2014 at 19:28
3
Solved
I want to delete a row/tuple from a parent table, but it is throwing an error message because it has a FOREIGN KEY reference in its child table.
However, in my case I want to delete the record onl...
Galingale asked 7/3, 2014 at 8:29
4
Solved
A good way to quickly survey the information in a database is to apply a tool that automatically creates a database diagram of all tables and all relationships between them.
In my experience...
Mamelon asked 11/8, 2011 at 18:48
1
Solved
I have two tables with below structure :
*Table User*
id int identity
username varchar
role varchar
*Table Ticket*
id int identity
admin_id int
user_id int
admin_id and user_id are the forei...
Char asked 17/8, 2014 at 20:46
3
Solved
class Basket:
name = models.CharField(max_length=50, blank=True, null=True)
class Apple:
name = models.CharField(max_length=50, blank=True, null=True)
basket = models.ForeignKey(Basket, on_dele...
Kook asked 11/8, 2015 at 18:57
2
Solved
In Django REST framework (2.1.16) I have a model with nullable FK field type, but POST creation request gives 400 bad request which says that field is required.
My model is
class Product(Model)...
Kinkajou asked 17/1, 2013 at 15:17
1
Solved
I'm very new to SQLAlchemy and I'm trying to figure it out.
Please have in mind the following test setup:
class Nine(Base):
__tablename__ = 'nine'
__table_args__ = (sqlalchemy.sql.schema....
Berey asked 3/8, 2015 at 18:24
2
Solved
I have two related tables:
[GameDataGroup] with PK
[Arena_GameData] with FK
I try to execute query:
DELETE FROM [ACP_MAIN_STABLE_DB_content].[dbo].[GameDataGroup]
WHERE [key] LIKE '%' + '_t...
Raffarty asked 27/4, 2015 at 8:37
1
Solved
The Alembic migration for a SQLite database:
def upgrade():
with op.batch_alter_table('my_table') as batch_op:
batch_op.add_column(sa.Column('parent_id', sa.String(24)))
batch_op.create_foreign...
Cerebroside asked 11/6, 2015 at 14:53
2
Solved
I have primary key column, which has some external foreign key references. Very usual. I forgot to add AUTO_INCREMENT for it. Now I execute
ALTER TABLE chat.users
CHANGE COLUMN user_id user_id I...
Pinite asked 26/3, 2015 at 13:59
1
Solved
I have the following models
Category:
<?php
class Category extends Eloquent {
protected $table = "category";
protected $fillable = array('title','parent','metatit','metadsc','metake','metau...
Cohbath asked 8/3, 2015 at 18:29
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