Database developers often disagree about whether it’s better to use naturally occurring data or meaningless values as a table’s primary key. Technically, there is no right or wrong to this ...

Some database designers may feel that it’s OK to arbitrarily assign all dimensional foreign keys as part of a fact’s primary key even when one or more do not actually contribute to the fact table’s ...

This, or these, attribute (s) are the candidate key (s) for the structure. The candidate key is also known as the primary key, or if a structure has multiple candidate keys, then one of them is ...

The column (field) in a relational database that uniquely identifies the row in the table. For example, account number is often a primary key. A "composite primary key" or "super key" is made up ...

All documents in a MongoDB collection have a primary key dubbed _id . This field is automatically assigned to a document upon insert, so there’s rarely a need to provide it. What’s interesting ...

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.

The primary keys provide administrator level access to Cosmos DB instances with full read/write/delete permissions. The database service also requires users to have secondary keys as well to make ...