foreign-key-relationship
How can I take advantage of my model associations in my view and controller in Ruby on Rails 3?
I am new to Rails and am trying to set up my Models and was wondering how Rails handles associations.[详细]
2023-03-04 22:01 分类:问答Entity Framework saving data in one-to-one associations
I\'m trying to use the foreign key association approach to achieve a one-to-one association in EF. In my case there\'s an association between a User and a Team, and I need a navigation property in eac[详细]
2023-03-04 19:20 分类:问答Foreign Key Constraints in Oracle
I have Entity Relationship Model (ERD) where entities IndividualCategory and TeamCategory relate to entity Category. Now I want to create tables in Oracle DB. I started like this:[详细]
2023-03-02 18:07 分类:问答Oracle - How to enforce rules on relationships depending on attributes records (simple example)
In a school system I have 2 tables, one called Staff which holds records of all member of staff for a school, teachers, admin, cooks and cleaners etc. Then I have a second table called Course with a f[详细]
2023-03-02 03:50 分类:问答How to pass foreign key attributes down through a nested form in Rails 3
I have three models: class Client < ActiveRecord::Base has_many :balancesheets has_many :investment_assets, :through => :balancesheets[详细]
2023-03-01 09:28 分类:问答Counting how many time a relation is pointing at the same key
SELECT t.tag_name FROM tags t JOIN resource_tags rt ON rt.tag_id = t.tag_id JOIN resource r ON r.resource_id = rt.resource_id[详细]
2023-02-28 10:17 分类:问答foreign key problem - mysql
i have this mysql code, but when i delete an element of agrupamento, the child is not deleted in emprego, and it is supposed.[详细]
2023-02-28 04:39 分类:问答InnoDB returning strange results?
I created a test database as I need to switch to InnoDB because I need to use foreign keys and transactions.[详细]
2023-02-28 02:37 分类:问答Joining tables with anonymous foreign keys
Related Related to my other question: Comment system design 开发者_开发百科Data Design Let\'s say I have a tags table:[详细]
2023-02-26 03:44 分类:问答Entity Framework Code-First - Defining relationships with MembershipUser
I\'m trying to understand the best way to define my POCO classes to be able to use Entity Framework code-first feature.[详细]
2023-02-25 11:38 分类:问答