In a relational database approach, regardless of whether one is considering persisted data or transitory query results, almost everything is viewed as a logical table. Associations between these ...

A foreign key is a relationship between two entities. Generally speaking, inter-entity relationships are one-to-many, e.g., an ORDER has many ORDER LINEs, and so forth. Even a case that may start out ...

The intelligence agency delves into some details about how it collects, stores and accesses data but leaves many key questions unanswered.

To link databases together to create a relational database, a foreign key is used. A foreign key is a field in one table that is linked to the primary key in another table.