Database Management Systems Functional Dependencies Quiz

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10 Questions

Functional dependencies (FDs) are used to specify formal measures of the ______ of relational designs

goodness

And keys are used to define normal forms for ______

relations

The functional dependency (FD) is a relationship that exists between two ______

attributes

A set of attributes X functionally determines a set of attributes Y if the value of X determines a unique value for ______

Y

An instance of a relation that satisfies all such real-world constraints is called a legal instance of the relation; A legal instance of a database is one where all the relation instances are legal ______

instances

What are functional dependencies (FDs) used to specify?

Formal measures of the 'goodness' of relational designs

In database management, what does a set of attributes X functionally determine a set of attributes Y mean?

The value of X determines a unique value for Y

What is an instance of a relation that satisfies all real-world constraints called?

Legal instance of the relation

What are keys used for in database management?

To define normal forms for relations

What does the functional dependency (FD) represent?

A relationship between two attributes

Study Notes

Functional Dependencies (FDs)

  • Functional dependencies (FDs) are used to specify formal measures of the integrity of relational designs.
  • FDs are a relationship between two attributes.

Functional Determination

  • A set of attributes X functionally determines a set of attributes Y if the value of X determines a unique value for Y.
  • This means that if X is known, Y can be determined.

Legal Instances

  • An instance of a relation that satisfies all real-world constraints is called a legal instance of the relation.
  • A legal instance of a database is one where all the relation instances are legal.

Keys

  • Keys are used to define normal forms for relational databases.
  • Keys help to identify unique tuples in a relation.

Test your knowledge of Database Management Systems Functional Dependencies with this quiz. Challenge yourself with questions on FDs, keys, relational designs, and constraints. Prof. Shilpa S's expertise in the subject ensures a comprehensive assessment.

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