Podcast
Questions and Answers
Which of the following scenarios best illustrates the concept of determination in the context of database attributes?
Which of the following scenarios best illustrates the concept of determination in the context of database attributes?
- Knowing the product ID allows you to look up its price. (correct)
- Knowing the customer's city allows you to infer their favorite color.
- Knowing the employee's name allows you to determine their department.
- Knowing the temperature allows you to guess the time of day.
Functional dependence implies a two-way relationship where each attribute mutually determines the other.
Functional dependence implies a two-way relationship where each attribute mutually determines the other.
False (B)
Explain what partial dependency is and why it is important to address it in database design.
Explain what partial dependency is and why it is important to address it in database design.
Partial dependency occurs when a non-key attribute is dependent on only part of the primary key. It's important to address because it leads to data redundancy and update anomalies.
A transitive dependency involves a functional dependence between attributes that are not part of the ______ key.
A transitive dependency involves a functional dependence between attributes that are not part of the ______ key.
Match the type of dependency with its description:
Match the type of dependency with its description:
Which of the following is an example of transitive dependency in a database table with attributes A, B, C, where A is the primary key?
Which of the following is an example of transitive dependency in a database table with attributes A, B, C, where A is the primary key?
Removing transitive dependencies from a database design generally improves data integrity and reduces redundancy.
Removing transitive dependencies from a database design generally improves data integrity and reduces redundancy.
In a table Orders with attributes OrderID (primary key), CustomerID, and CustomerCity, which dependency, if present, would violate 2NF (Second Normal Form)?
In a table Orders with attributes OrderID (primary key), CustomerID, and CustomerCity, which dependency, if present, would violate 2NF (Second Normal Form)?
Explain how identifying and resolving dependencies helps in normalizing a database.
Explain how identifying and resolving dependencies helps in normalizing a database.
If A -> B and B -> C, then A -> C demonstrates a ______ dependency.
If A -> B and B -> C, then A -> C demonstrates a ______ dependency.
Flashcards
Determination
Determination
A state where knowing one attribute's value allows you to know another's.
Functional Dependence
Functional Dependence
One attribute's value dictates the value of one or more other attributes.
Partial Dependency
Partial Dependency
Occurs when only a portion of the primary key is needed to determine another attribute's value.
Transitive Dependency
Transitive Dependency
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Study Notes
- Determination is the state where knowing one attribute's value reveals another's.
- Functional Dependence signifies one attribute's value determines one or more other attributes' values.
- Partial Dependency arises when only a portion of the primary key is needed to determine another attribute's value.
- Transitive Dependency occurs with functional dependence between non-primary key attributes.
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