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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the primary purpose of the selection operation?
💡 Hint: Think about how SQL's WHERE clause works.
Question 2
Easy
What happens during projection?
💡 Hint: Consider what SELECT in SQL does.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the primary role of a selection operation?
- Filters columns from a relation
- Filters rows from a relation
- Combines two relations
💡 Hint: Think about how you would narrow down a data set in SQL.
Question 2
True or False: A projection operation automatically removes duplicate rows.
- True
- False
💡 Hint: What happens when you use SELECT in SQL without DISTINCT?
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Consider a database with customer and order tables. Discuss how to select active customers who have placed orders above a certain value. Which operations would you use and in what order?
💡 Hint: Remember the logical order in query processing.
Question 2
Given two unsorted tables with millions of records each, determine the best join strategy. Discuss any possible performance issues.
💡 Hint: Consider the structure and size of the tables for efficient processing.
Challenge and get performance evaluation