entity-relationship

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Database design - Entity Relationship Model

I have the following problem that I need to express. There are persons, workplaces and sites. Each person can be assigned to multiple workplaces. Each workplace can have multiple persons. Each workpl[详细]

2023-03-24 07:02 分类：问答
How to create E-R diagram in mysql

I am using MySQ开发者_开发技巧L. There are 28 tables in my database. I\'ve tried to use MySQL Workbench to create E-R diagram. As there are 28 tables, everything is messed up in diagram using MySQL Wo[详细]

2023-03-23 03:14 分类：问答
Entity Framework code first outer join for interesting schema

So I have a schema I\'ve developed that has a table that acts a junction table for multiple entities.This is for the purpose of tagging.I have my entities use GUIDs and then I\'m able to centralize th[详细]

2023-03-22 00:48 分类：问答
Add/Remove many to many associations in Entity Framework

I have three tables in my sample database: Users ID Username Password Roles ID Name Description UserRoles UserID[详细]

2023-03-21 22:57 分类：问答
With DevForce Ideablade, how do I determine if a related entity has been removed from an entity?

Let\'s say I 开发者_Go百科have a one-to-many relationship between Person and Pet entities (linked with a simple table with fields PersonID, PetID).If I do this:[详细]

2023-03-21 09:38 分类：问答
SQL Relationships

I\'m using MS SQL Server 2008R2, but I believe this is database agnostic. I\'m redesigning some of my sql structure, and I\'m looking for the best way to set up 1 to many relationships.[详细]

2023-03-20 17:52 分类：问答
Objective-C: Many to many relationship with CoreData

I\'ve an iPhone applications with 2 models, Category and Content, which have a many-to-many relationship.[详细]

2023-03-20 05:05 分类：问答
EF4.1 (code first) - How to specify a composite relationship

In Linq to SQL I could specify a relationship that didn\'t have to depen开发者_StackOverflow中文版d on the foreign keys and pks existing in the database, useful for creating composite relationships li[详细]

2023-03-19 20:47 分类：问答
Ensuring object relationship consistency (doctrine 2)

I am having a problem ensuring that relations between my objects remain consistent. I am using Doctrine 2, but this probably applies to other languages and ORM mappers as well.[详细]

2023-03-19 17:42 分类：问答
select between two table in entity framework

I want to write a select between two table that have relation. I use this code but i get no result. Please advise me[详细]

2023-03-19 16:15 分类：问答