Relational Data Modeling - Foreign Key

Logical Data Modeling

Logical Data Modeling About A data model in software engineering is a graph of entity that try to represent the reality and describes how data are represented and accessed. the real world consists "...

Relational Data Modeling - Relationship

Relational Data Modeling - Relationship About relationship in a relational model. relation (generally a table) * an entity * or a relationship cardinality define the type of relationships b "...

Data Vault - Link

A Link table in the data vault methodology is: transactions, associations, hierarchies, and re-definition of business terms. Every table which has more than one foreign key is a candidate to becom "...

Db - Cassandra

Cassandra NoSql Database Cassandra is a NoSql database for transactional workloads that require high scale and maximum availability. Cassandra is suited for transactional workloads at high volume and "...

Dimensional Data Modeling - Measure

In a dimensional model, a measure is a quantitative attribute of a fact (in a fact table) that is not a foreign key that creates a relationship to a dimension. A measure permits to quantify. A calcula "...

Dimensional Data Modeling - Relationship

In a dimensional data model, you have mostly a one-to-many relationship between the dimension and the fact table between each level in a hierarchy man-to-many relationship are modeled with a bridge "...

Logical Data Modeling - Primary Key (Id, Name)

A Primary Key is a key that identify indefinitely uniquely an element: entity or a in their local scope. It's a part of the fully qualified identifier. Characteristic Immutable A real primary key i "...

RDBMS - Relational Model

The relational model for database management: is a set of principles for relational databases formalized by Dr. E.F. Codd in the late 1960s. is a database model based on first-order predicate logic "...

Relational Data Modeling - Association Table (Bridge, Cross)

An association table (bridge table) is a table that permits to implement: one-to-one relationship or many-to-many relationship Because most of database only support one-to-many relationships, it is "...

Relational Data Modeling - Foreign Key Constraint (one-to-many relationship)

A Foreign Key Constraint is a constraint that creates a one to many relationship between a primary key and a foreign key (ie between two tables) The foreign key constraint on a table A will : create "...