Top "Entity-relationship" questions

An entity-relationship model (ERM) is an abstract and conceptual representation of data, information aspects of a business domain or its process requirements.

How to know relations between tables

I have a database in MySQL created by someone. I don't have any documentation of the database. How can I …

mysql database-design wamp entity-relationship entity-relationship-model
Problem in mapping fragments in Entity Framework

I am using entity framework and I ran into an odd build error. I am building a forum and I …

entity-framework entity-framework-4 entity-relationship entity-framework-designer
Doctrine: Object of class User could not be converted to string

I keep getting this error with Doctrine: PHP Catchable fatal error: Object of class User could not be converted to …

php doctrine-orm entity-relationship
What are some of your most useful database standards?

I have some ideas, some that I have accumulated over time, but I really want to know what makes things …

sql database standards entity-relationship
Preventing N+1 queries in Rails

I've seen a few examples of passing an :include hash value when calling one of ActiveRecord's find methods in Rails. …

ruby-on-rails query-optimization entity-relationship select-n-plus-1
EF Code First - Fluent API (WithRequiredDependent and WithRequiredPrincipal)

I have the following class: public class User { public Guid Id { get; set; } public string Name { get; set; } public Couple …

ef-code-first entity-relationship fluent-interface
Decomposing a ternary relationship into binary relationships

I am designing a database that handles users, accounts and projects with the following relationships and constraints: An account has …

database-design entity-relationship
Core data many-to-many relationship - Predicate question

In my Core Data model I have two entities: List and Patient. List has an attribute called 'name'. A List …

iphone cocoa cocoa-touch core-data entity-relationship
A tool to automatically generate a UML diagram for a Rails Application

Looking for a good tool/gem that can automatically generate a nice looking UML diagram for an existing rails application. (…

ruby-on-rails uml entity-relationship
rails 3 scaffolding of relational model

are there any tutorials out there how to scaffolding a simple model that uses many-to-many relationships?

mysql ruby-on-rails ruby-on-rails-3 entity-relationship