Top "Composite-key" questions

A composite key is a database key whose value is made up of multiple typed values

Composite Primary Key performance drawback in MySQL

We have a table with a composite Primary key consisting of three fields (and it is in MySQL 5.1). There are …

mysql performance primary-key composite-key
Composite Key/Id Mapping with NHibernate

I have the following tables in my database: Announcements: - AnnouncementID (PK) - Title AnouncementsRead (composite PK on AnnouncementID and …

nhibernate fluent-nhibernate nhibernate-mapping composite-key composite-id
Defining Composite Key with Auto Increment in MySQL

Scenario: I have a table which references two foreign keys, and for each unique combination of these foreign keys, has …

mysql innodb auto-increment composite-key
Composite primary key, foreign key. Reference to object or key?

I have two classes Foo and Bar. The tables in the database look like this: |Foo| |id : INT (PK) | bar_…

java jpa composite-key
how to create a composite key in MySQL database

i am working on mysql server.where i have created a table, named question . column/attributes of this table are (…

mysql composite-key composite-primary-key
How to make a composite key to be unique?

I am making a database of students in one school.Here is what I have so far: If you don't …

mysql sql database-design uml composite-key
How to create a composite primary key which contains a @ManyToOne attribute as an @EmbeddedId in JPA?

I'm asking and answering my own question, but i'm not assuming i have the best answer. If you have a …

jpa jpa-2.0 composite-key many-to-one
Why are composite keys discouraged in hibernate?

This is from Hibernate official tutorial: There is an alternative <composite-id> declaration that allows access to legacy data …

java database hibernate orm composite-key
Foreign key mapping inside Embeddable class

I am using eclipselink for JPA. I have an entity, which has a composite key fabricated out of two fields. …

java jpa entity-relationship composite-key embeddable
Hibernate foreign key with a part of composite primary key

I have to work with Hibernate and I am not very sure how to solve this problem, I have 2 tables …

java hibernate foreign-keys composite-key composite-primary-key