Which of the following database models represent entities as two-dimensional tables, with records as rows, and attributes as columns?
A) relational database model
B) hierarchical database model
C) network database model
D) object-oriented database model
E) semantic database model
Question 2
A ________ key refers to an attribute that appears as a non-primary key attribute in one entity and as a primary key attribute (or part of a primary key) in another entity.
A) primary
B) table
C) foreign
D) super
E) candidate
Four main models that describe the relationship between ecosystem function and biodiversity.
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