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Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
Ans: One-to-Many: the meaning of one to many is that at most one entity in set A is assigned to any number of entities in set B. For instance Employee in set A has any number of Phone numbers in set B.
Many-to-Many: the meaning of many to many is that any numbers of entities in set A assigned to any number of entities in set B. For instance various employees in set A may have various accounts in set B.
What is a virtual table that draws its data from the result of an SQL SELECT statement? View is a virtual table that draws its data from the result of an SQL SELECT statement.
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