Question: What is a primary key Are duplicate primary keys allowed
What is a primary key? Are duplicate primary keys allowed? Why or why not?
Answer to relevant QuestionsWhat is the difference between a natural key and an invented key? Which type is most commonly used in business information processing?What types of data (or fields) should never be stored more than once in a relational database? What types of data (or fields) usually must be stored more than once in a relational database?How is a many-to-many relationship without attributes represented in an object database?Briefly describe the following distributed database architectures: replicated database servers, partitioned database servers, and federated database servers. What are the comparative advantages of each?Access the Object Database Management Group Web site (www.odmg.org) and gather information on the current status of the ODMG standard.
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