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Questions and Answers
Functional dependencies (FDs) are used to specify formal measures of the ______ of relational designs
Functional dependencies (FDs) are used to specify formal measures of the ______ of relational designs
goodness
And keys are used to define normal forms for ______
And keys are used to define normal forms for ______
relations
The functional dependency (FD) is a relationship that exists between two ______
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 ______
A set of attributes X functionally determines a set of attributes Y if the value of X determines a unique value for ______
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 ______
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 ______
What are functional dependencies (FDs) used to specify?
What are functional dependencies (FDs) used to specify?
In database management, what does a set of attributes X functionally determine a set of attributes Y mean?
In database management, what does a set of attributes X functionally determine a set of attributes Y mean?
What is an instance of a relation that satisfies all real-world constraints called?
What is an instance of a relation that satisfies all real-world constraints called?
What are keys used for in database management?
What are keys used for in database management?
What does the functional dependency (FD) represent?
What does the functional dependency (FD) represent?
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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.
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