MongoDB Objects - Data Modeling for MongoDB - page 60

Entity Table Collection

Attribute or Data ele-
ment

Data element, Field or
Column

Field

Attribute value or
Data element value

Data element value, Field
value, or Column value

Field value

Format domain Datatype Datatype

Captured but not enforced either through a reference, which is
similar to a foreign key, or through embedded documents.

Relationship Constraint

Candidate key
(Primary or Alternate
key)

Unique index Unique index

Globally Unique Id
(GUID)

Surrogate key ObjectId

Foreign key Foreign key Reference

Secondary key Non-unique index