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Why do we designate one of the candidate keys of a relation to be the primary key?

ASSIGNMENT 5.1Define the following terms as they apply to the relational model of data: domain, attribute, n-tuple, relation schema, relation state, degree of a relation, relational database schema, and relational database state. 5.2. Why are tuples in a relation not ordered? 5.3. Why are duplicate tuples not allowed in a relation? 5.4. What is the […]

Discuss the characteristics of relations that make them different from ordi- nary tables and files.

Define the following terms as they apply to the relational model of data: domain, attribute, n-tuple, relation schema, relation state, degree of a rela- tion, relational database schema, and relational database state. Why are tuples in a relation not ordered? Why are duplicate tuples not allowed in a relation? What is the difference between a […]

Identify all keys in each data table (i.e., primary key, alternate key, secondary key, and foreign key) when applicable.

Identify all keys in each data table (i.e., primary key, alternate key, secondary key, and foreign key) when applicable. List DBDL for each of your tables using the format described in the “Database Design Language (DBDL)” section (p. 181) in Chapter 6 of Concepts of Database Management. For an example, review Figure 6-1.

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