SQL query, primary key to several foreign keys

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 |

sql - update two key columns without conflict

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

Retrieving datasets from a cross-linked table in a single query

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

Validate if the foreign key exists if it is not null

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

Foreign key constraint Sql

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),

django-salesforce foreign key syntax

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

The foreign key syntax error table is not created

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

Django postgresql foreign key

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

Django: foreign key relationship according to the choice

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

MySQL joins four tables and gets some kind of SUM result

I have four tables like this: mysql> describe courses; +-----------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-------------+------+-----+---------+----------------+

Find all tables with a given foreign key

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

No foreign key constraints and need for complicated deletion

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

Get foreignkey queryset

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

How to set a foreign key to null? (Symfony)

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

Which foreign key to use in a many-to-one table

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

How to design this simple database?

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

How to know if the column of a model is a foreign key?

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'])

Non-zero foreign keys as standard database

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

Managing foreign key exceptions in PHP

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

Acceleration of the SQL query when sorting on foreign keys

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

To obtain primary and foreign keys directly in ERD

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

How to get all tables that have FK to another table?

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