relationships

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SQL Server 2008 - Multiple Cascading FK's - Do i need a trigger?

I have a 1..* relationship between User and Post. (one user has many posts) Post has a FK called \"UserId\", which maps to the \"UserId\" field on User table.[详细]

2023-02-12 21:20 分类：问答
Rails 3 and Mongoid: Can't seem to setup a one-to-many relationship

I have a User model and a Tracker model the goal is to have a user having: - one tracker that was created by this user[详细]

2023-02-12 11:56 分类：问答
Storing relationship in mysql database

I\'m creating a many to many relationship between content, but to simplify it I\'ll use an easier relationship for now. An example would be a relationship between movies. What would be the right way t[详细]

2023-02-08 14:55 分类：问答
Multiple relationships in CakePHP

Suppose (for lack of better example) I have a model Person and another model Twin (meaning a pair of twins). Twins has two Person foreign keys, say first_born_id and second_born_id referencing the id[详细]

2023-02-03 03:48 分类：问答
How to delete records permanently in case of linked tables?

Let\'s say I have these 2 tables QuesType and Ques:- QuesType QuestypeID|QuesType|Active ------------------------------------[详细]

2023-02-02 09:49 分类：问答
HABTM relationship with an array

I am a beginner with Rails 3 programming and I have one problem with creating the right model. Let\'s say there is an application to manage the bibliography of a book, that is manage the mapping for[详细]

2023-02-02 08:01 分类：问答
relationship to a Django many to many relationship?

I\'m relatively new to Django and OO, so I may be missing something obvious, but I can\'t wrap my head around how to model the following:[详细]

2023-02-02 06:45 分类：问答
XML to dataset - problem finding what datarow contains a datatable

Sorry if the description is poor, but I don\'t know how else to put this... But here is an example of the XML structure[详细]

2023-01-29 01:56 分类：问答
How can I maintain a CoreData table which can be edited outside its relationship to another table?

Let\'s say I have a table called \"Event\" which has a to-many relationship with table \"Group\" which has a to-many relationship with table \"Person\".[详细]

2023-01-28 16:25 分类：问答
hasMany reduced to hasOne in CakePHP

Basically I have following models in CakePHP: User(id, username) Photo(id, user_id, path) 开发者_开发技巧I have set up following relation: User hasMany Photo.[详细]

2023-01-23 01:54 分类：问答