Practice Closure Of An Attribute Set (a+) (6.2.4) - Normalization - Introduction to Database Systems
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Closure of an Attribute Set (A+)

Practice - Closure of an Attribute Set (A+)

Learning

Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What does the closure of a set of attributes represent?

💡 Hint: Think about the function of dependencies.

Question 2 Easy

List the first step in the Chase Algorithm.

💡 Hint: What do we start with when computing A+?

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What does A+ represent?

All attributes functionally determined from A
Only attributes in a relation R

💡 Hint: Think about what closure means.

Question 2

True or False: The Chase Algorithm always leads to new attributes being added to A+.

True
False

💡 Hint: What happens when nothing else can be derived?

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Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Given functional dependencies F = {X→Y, Y→Z, Z→X, W→X} and starting with A = {W}, determine A+ and describe your steps clearly.

💡 Hint: Follow the dependencies closely and remember to add step by step.

Challenge 2 Hard

Construct a relation with three attributes A, B, C, and dependencies such that A and B can be a candidate key and show your closure A+ with at least three functional dependencies.

💡 Hint: Think creatively about relationships between attributes to form dependencies.

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Reference links

Supplementary resources to enhance your learning experience.