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Chapter 5: Problem 1

Define the following terms: domain, attribute, n-tuple, relation schema, relation state, degree of a relation, relational database schema,relational database state.

Short Answer

Expert verified
The various terms refer to different aspects of a relational database. A domain refers to the set of allowed values for an attribute; an attribute is a named column of a relation; an n-tuple is an ordered list of n values; a relation schema is a blueprint describing the structure of a relation; a relation state is a set of n-tuples; the degree of a relation is the total number of its attributes; a relational database schema is a collection of relation schemas describing the structure of a relational database; finally, a relational database state is a set of relations that have stored data.

Step by step solution

01

Define Domain

A domain refers to the set of permitted values for an attribute. For example, the domain of an attribute 'AGE' in 'STUDENT' relation would consist of all possible age values that the students can have.
02

Define Attribute

An attribute is a named column of a relation. An attribute can store only a single value.
03

Define n-tuple

An n-tuple is an ordered list of n values which each value coming from the domain of the attribute of the relation. It comprises an atomic value for each attribute of the relation.
04

Define Relation Schema

A relation schema can be considered as the blueprint of a relation. It is consists of a list of attribute names and their associated domains.
05

Define Relation state

Relation state refers to a relation containing tuples. It is a set of n-tuples.
06

Define Degree of a relation

The degree of a relation is the total number of attributes that it contains. It is also referred to as the arity of the relation.
07

Define Relational Database Schema

A relational database schema is a collection of relation schemas or blueprint of a relation. It describes how data is going to be stored in a relational database.
08

Define Relational Database state

Relational Database state refers to a set of relation that has stored data at a specific point in time.

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Most popular questions from this chapter

Why are tuples in a relation not ordered?

Discuss the entity integrity and referential integrity constraints. Why is each considered important?

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

. Consider the following relations for a database that keeps track of business trips of salespersons in a sales office: SALESPERSON(SSN, Name, Start Year, DepcNo) TRIP(SSN, From_City, To_City, Departure_Date, Return_Date, Trip ID) EXPENsE(Trip ID, Accountg, Amount) Specify the foreign keys for this schema, stating any assumptions you make.

Why are duplicate tuples not allowed in a relation?
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