I'm having a problem which i cannot manage to fix. I've been looking at some other posts but most of them were either to complex for me to understand/use or do not deal with the same problem. First the tables: Person id | amt ============= 1 | 5 2 |
I'm having a strange problem with Rails 4.2.4. I am creating a new table, which references some others, like this: t.references :local, index: true, foreign_key: true, null: false t.references :serie, index: true, foreign_key: true, null: false when
I have an SQLite database, with a table having an auto increment integer as a primary key, and another table that is linked to this first table, through a foreign key. I don't understand how I can choose which row from the first table is to link with
i have three classes. Place is foreignkey of Activity(where the activity takeplace), Park and Restarant are inherited from Place. class Activity(Model): place=ForeignKeyField('Place') .... class Place(Model): address=CharField(max_length=200) .... cl
I want to to update a column from table patient, and add a prefix before all its fields, like update patient set contactdetailsID = '99999'+ contactdetailsID where patient.id = 5294 So, row with id = 5294, will have the same value in column contactde
Imagine the following MySQL table environment: admins id username usergroups id groupName adminXusergroup (crosslinking table) id adminId groupId adminId and groupID are indexed and foreign key relations are configured accordingly (adminId points to
I have a many-to-one relationship defined in Rails 4: class Event < ActiveRecord::Base belongs_to :user end How do I check, that the :user key exists if it is set? The following correctly checks, that the key exists but does not allow for `nil? value
I have a table with two FK from same table. I have following query: I am attaching an Image: please let me know the error. You have to put , char after 8th line as below REFERENCES Teams(TeamID),
If I have a table where each row is a customer booking, is it OK to have 2 foreign keys in this table: one which will be null and the other referencing the primary key approriate. The reason I have two tables with the foreign key constraint applied t
I'm using django-salesforce to get a list of Contacts (child) and the Accounts (parent) associated with them. In my models.py, what is the syntax for defining a field in the Contact class to hold the Account name? Here's my models.py: from django.db
My table is not being created because of a FOREIGN KEY syntax error but I cant seem to figure it out. I made sure I created the int first before I called the FK. Here's teh code for my class with the FK public class PlayerStatsDatabase { public stati
I created table with FOREIGN KEY and can't insert anything. CREATE TABLE menus ( id int(10), parent_id int(10), label varchar(255), PRIMARY KEY (id), FOREIGN KEY (parent_id) REFERENCES menus (id) ); I need FOREIGN KEY to automatically delete children
I have this models.py from django.db import models from django.contrib.auth.models import User class Service(models.Model): user = models.ForeignKey(User) name = models.CharField(max_length=800, blank=False) service = models.CharField(max_length=2000
Sometimes I have problems using my BD At Work. Usually is when i try to recover or update a table in Java with the session closed (the famous LazyInitializatioException ). And at the end, sometimes the problem is that exists a foreign key pointing to
In Django, is there a way to create the following dynamic relationship between models? class ClothingMale(models.Model): # male specific fields class ClothingFemale(models.Model): # female specific fields class Person(models.Model): gender = models.I
Consider this situation: a Car is bought from a Salesperson. A Salesperson works at a Showroom (and at only one Showroom). A Showroom is affiliated to a Manufacturer, and only sells cars made by that Manufacturer. At the same time, a Car is of a part
I have four tables like this: mysql> describe courses; +-----------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-------------+------+-----+---------+----------------+
I have a table A that has primary key Id. I want to find all tables that contain this key as foreign. Number of tables is about 100, so its rather impossible to use generated database diagram. Is it any way to to query database schema objects to find
I have a website which I have been working on creating very rapidly, and now am paying back some technical debt. I have a complicated issue: My site deals with scheduling hikes. Once you create a hike, it has many things associated with it: a message
I need to obtain a queryset of a foreignkey but I haven't been able to figured out how. I have the following model: class Contact(models.Model): owner = models.ForeignKey(CustomUser, related_name='contact_set') referenced = models.ForeignKey(CustomUs
I have a form with an input which is optionnal but I can't valid the form if the user don't fill it because it's a foreign key and Doctrine shows me an error. SQLSTATE[HY000]: General error: 1452 Cannot add or update a child row: a foreign key constr
Suppose I have a table Books with columns Book_ID (Primary Key), ISBN (Unique), and several others such as Title/author/etc. I have another table Sales, with primary key Sale_ID, a foreign key to link to Books, and other fields with info on Sales. Sa
I have 2 tables - one storing user information (id, username, password) and the second one storing information about events (id, name, description, date, username(represents the user who created the event)). I would like to implement 'favourite event
I'm dynamically storing information in the database depending on the request: // table, id and column are provided by the request table_obj = getattr(models, table) record = table_obj.objects.get(pk=id) setattr(record, column, request.POST['value'])
Background: today, an issue arose while using SQL Server Reporting Services. It seems that SSRS drop-down parameters in the report viewer don't allow you to indicate a (null) option so that you can see a report where that parameter is null. Basically
What is the best way in PHP to handle foreign key exceptions on a mysql database? Is there a mysql class that can be used to simplify any code? Ideally, what I want to do, as an example, is to try to delete a record where it is the foreign key parent
This is more of a generic SQL problem but I'm using Firebird 2.5 if anyone knows of a Firebird/Interbase specific optimization. First, the following is a simplified example schema to illustrate the issue I'm trying to solve: CREATE TABLE users ( id I
I read my notes and I am now unsure about the keys. My logical diagram alt text http://files.getdropbox.com/u/175564/db/db-11.png This table should be in line with the following physical ERD alt text http://files.getdropbox.com/u/175564/db/db-22.png
If I have two tables - Logins and Users, as follows: Logins LoginIdNo UserIdNo HashedPassword Users UserIdNo LoginIdNo Username Each login "has a user" and each user "has a login" but which "belongs to" which? Is it simply a
Is there any way to get all tables that have foreign keys to another table in oracle with a query?Here is a good article with an answer: select owner,constraint_name,constraint_type,table_name,r_owner,r_constraint_name from all_constraints where cons
