foreign-key-relationship

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Working with null's in MySQL database. One of three foreign keys have to be not null.

my problem is that i have to make table which will have foreign keys, and one of three foreign keys have to be NOT NULL and rest have to be NULL.[详细]

2023-03-23 08:41 分类：问答
Foreign key from table A on table A

I have a table with users users +------+ - user_id ... ... - updated_by as I understand column updated_by should 开发者_JAVA技巧reference this table on column user_id. I\'m not sure, that this[详细]

2023-03-23 00:35 分类：问答
How to map collections to mongodb using datanucleus/jdo?

I\'m trying to map an existing mongodb database to domain objects using datanuclues (3.0.0-m6) / JDO.[详细]

2023-03-22 05:07 分类：问答
Query a table by using foreign key navigation properties in LINQ with C#

I have the following LINQ to SQL EF classes: with the foreign key relationship on SessionId (primary table WebinarSession).[详细]

2023-03-21 12:53 分类：问答
Add comboBox in a JTable for a DB foreign keys

I am doing a DatabaseManager Proyect where I display all the data of a db table in a JTable. Now I want to insert a feature so that the foreign keys of a table are displayed as a ComboBox with the val[详细]

2023-03-20 07:36 分类：问答
A large amount of foreign keys in mysql ? this is good?

Hey guys (and probably girls). I\'m modelling a huge database in mysql for a company that i work and i\'m stucked on things that you might help me.[详细]

2023-03-19 06:13 分类：问答
Foreign keys, where they belong depending on relationships

I\'ve worked with databases a fair bit (MySQL, Oracle) though typically only DML as the systems had been previously engineered.[详细]

2023-03-17 18:53 分类：问答
What does principal end of an association means in 1:1 relationship in Entity framework

public class Foo { public string FooId{get;set;} public Boo Boo{get;set;} } 开发者_Python百科 public class Boo[详细]

2023-03-16 04:25 分类：问答
Entity Framework model from DB2 tables with composite keys

We are testing EF 4.1 against DB2 tables on a Main Frame. We are now able to generate EF models from DB2 tables and retrieve data :)[详细]

2023-03-15 19:04 分类：问答
Foreign key with composite primary key not working in MySql

I have the following SQL script.After it runs the foreign key relationship is never enforced. CREATE TABLE Country ([详细]

2023-03-15 06:17 分类：问答