Author Question: Which of the following best describes an attribute or combination of attributes that could be used ... (Read 90 times)

kamilo84 · **on:** Jul 7, 2018

Which of the following best describes an attribute or combination of attributes that could be used as the primary key for an entity?

A) Candidate key
B) Natural key
C) Surrogate key
D) Composite key

Question 2

Which of the following is not an error when drawing a data flow diagram?

A) all data flowing into a process or out of a process
B) data flow on a child diagram that has only one end connected to a process, the other end is a point in space
C) connecting data stores and external entities directly to each other
D) placing more than nine processes on a data flow diagram