relationships

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Would you mind sorting through a few Beginner SQL invoice database creation questions?

I\'m somewhat new to SQL. I need to make an invoice that can be queried to create a document that looks something like this:[详细]

2023-03-17 15:56 分类：问答
Xcode4 Core Data Relationships

I\'ve once again read through the Apple developer Core Data documentation and found it lacking when it comes to the graphical Xcode 4 editor when creating SQLLite entities much as I found it lacking w[详细]

2023-03-16 12:19 分类：问答
Rails - data view from has_many and Has_many_and_belongs_to_many

I\'m trying to implement this project: http://img7.imagebanana.com/img/cnb46ti2/relationships.png I want to let view the skills of an employee on the employee\'s show page[详细]

2023-03-14 04:31 分类：问答
Core data storing link to parent record only on last child record stored

I\'ve got a core data model created using XCode 4 that is doing something weird.I have an entity called ProbeObj that has a defined relationship with a second entity called SmokeObj.In the diagram, I\[详细]

2023-03-11 23:38 分类：问答
Relationship Problem in SQL (Column can't be cascaded)

I have 3 tables (Patient,Doctor,Appointments) patient has a primary key(Patient_ID)and a foreign key (Doctor_ID)[详细]

2023-03-11 20:42 分类：问答
EF Code First: Many-to-many and one-to-many

This is probably just because my knowledge with the EF Code First fluent API is lacking, but I\'m stumped.[详细]

2023-03-10 10:11 分类：问答
Specifying conditions on a relationship in Ruby on Rails

I have the following has_many :administrators, :class_name => \"User\", :conditions => \"role_id = 4\"[详细]

2023-03-08 17:06 分类：问答
Polymorphic vs HABTM relationships for a tagging system

I am currently making a database for a rails application. This schema involves three models: Photo, Object and Tag. Both photos and objects need to be \"taggable\".[详细]

2023-03-04 05:29 分类：问答
Should I Use a FetchedResultsController for Objects in a Constantly Updating Relationship?

I have a simple Coredata model with one entity called \"conversation\" and the other one \"messages\". Basically, I need to kind of reproduce the iPhone sms application.[详细]

2023-02-26 06:08 分类：问答
Django model class that can either have one relationship or another?

To give you an idea of the problem I\'m trying to solve I\'ll use an example. The issue is that there can be multiple possible relationships between classes, and how to represent this in the models fi[详细]

2023-02-24 13:01 分类：问答