Sunday, June 3, 2007

Question 70

There are three data models: hierarchical, network, and relational. Which of the following descriptions concerning a hierarchical model is proper?

a) Data can be represented in several two-dimensional tables.
b) It is possible for a single record to have more than one parent record.
c) A redundant representation results when expressing an object which has a network structure.
d) Since the relationship between records need not be designed beforehand, they can be dynamically established during data manipulations


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