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Tag: Integrity constraints

How does SQL allow implementation of the entity integrity and referential integrity constraints described in Chapter 3?

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Basic SQL 6.1. How do the relations (tables) in SQL differ from the relations defined formally in Chapter 3? Discuss the other differences in terminology. Why does SQL allow duplicate tuples in a table or in a query result? 6.2. List the data types that are allowed for SQL attributes. 6.3. How does SQL allow […]

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

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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 […]

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