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.
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
I\'m trying to map an existing mongodb database to domain objects using datanuclues (3.0.0-m6) / JDO.
I have the following LINQ to SQL EF classes: with the foreign key relationship on SessionId (primary table WebinarSession).
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
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.
I\'ve worked with databases a fair bit (MySQL, Oracle) though typically only DML as the systems had been previously engineered.
public class Foo { public string FooId{get;set;} public Boo Boo{get;set;} } 开发者_Python百科 public class Boo
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 :)
I have the following SQL script.After it runs the foreign key relationship is never enforced. CREATE TABLE Country (
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